How to Update to iOS 15
Com actualitzar a iOS 15
iOS 15 Update Problem
Problemes d'actualització d'iOS 15
How to Downgrade
Com baixar de nivell

Reducció d'iOS 15: com fer-ho amb seguretat i facilitat

• Preparar-se per a la baixa
• Com baixar iOS 15
• Selecció d'eines de baixada d'iOS 15
• Reducció de problemes solucionats
• Preguntes freqüents sobre la baixada d'iOS 15

Part 1. Esteu ben preparat per a la baixada d'iOS 15?

S'ha publicat l'última actualització d'iOS, però els usuaris ja es queixen d'alguns dels seus errors. Per superar aquests problemes, podeu considerar fer una baixada d'iOS 15. Tanmateix, hauríeu de fer un pas enrere i comprendre la seva repercussió. Per exemple, una baixada pot esborrar totes les dades existents al telèfon, incloses les teves fotos, aplicacions, contactes, etc. Per tant, és important prendre les precaucions necessàries abans de desfer una actualització d'iOS 15 a l'iPhone.

1.1 Fes una còpia de seguretat del teu dispositiu

Això és el més important que hauríeu de tenir en compte abans de rebaixar iOS 15 a una versió estable anterior. Quan rebaixem un dispositiu iOS, és possible que acabi suprimint totes les dades emmagatzemades en ell. Des de fitxers multimèdia fins a dades d'aplicacions, és possible que acabis perdent tot el contingut existent al telèfon durant el procés. Per tant, la millor manera d'aprendre a baixar d'iOS 15 a una versió estable és fent una còpia de seguretat del telèfon. D'aquesta manera, després d'haver acabat la baixada, podeu recuperar fàcilment les vostres dades importants restaurant-ne la còpia de seguretat.
Còpia de seguretat d'iDevice amb Dr.Fone
  • 1Connecteu el vostre iPhone o iPad a l'ordinador.
  • 2Trieu a mà el tipus de dades o seleccioneu-les totes.
  • 3Feu clic al botó "Còpia de seguretat" per fer una còpia de seguretat local de les dades del dispositiu.
Característiques úniques:
  • •Feu una còpia de seguretat d'un dispositiu iOS sencer, inclosos els seus contactes, registres de trucades, missatges, fotos, vídeos, etc.
  • •Fes una còpia de seguretat i restaura les teves dades d'un dispositiu a un altre (o d'una versió d'iOS a una altra) sense cap problema de compatibilitat.
  • •Extreu una còpia de seguretat d'iCloud o iTunes existent i restaura-la al dispositiu que escollim.
  • •Previsualitza les dades d'un fitxer de còpia de seguretat per restaurar-lo de manera selectiva. Les dades existents es conservaran mentre es restauren la còpia de seguretat.
descarregar descarregar

Còpia de seguretat de l'iDevice amb iTunes

  • 1Inicieu una versió actualitzada d'iTunes i connecteu-hi el dispositiu iOS.
  • 2Aneu a la seva pestanya "Resum" i cerqueu l'opció rellevant a la pestanya "Còpies de seguretat".
  • 3Feu clic al botó "Còpia de seguretat ara" per desar la còpia de seguretat del vostre dispositiu.
Coses a tenir en compte:
  • •iTunes no pot restaurar una còpia de seguretat d'una versió superior d'una versió inferior. Per tant, heu de fer una còpia de seguretat del vostre dispositiu abans d'actualitzar-lo a iOS 15.
  • •No hi ha cap disposició per previsualitzar les dades i restaurar-les selectivament.
  • •iTunes esborra les dades existents al vostre iPhone mentre restaura una còpia de seguretat.
Obteniu iTunes ara

1.2 Entendre el límit de temps per a la baixada d'iOS

Tot el procés de baixada d'una versió d'iOS és sensible al temps, cosa que molts usuaris no són conscients. Parlem d'això en detall.

  • Si teniu instal·lada una versió beta d'iOS, podeu baixar la versió beta d'iOS a una versió estable anterior en qualsevol moment que vulgueu (fins que es publiqui la versió pública oficial d'iOS).
  • Després del llançament de la versió pública estable d'iOS, només teniu 14 dies per rebaixar el vostre dispositiu a una versió anterior d'iOS existent.

1.3 Seleccioneu la versió correcta per baixar d'iOS 15

L'ideal és que només podeu rebaixar iOS 15 a una versió estable anterior. Per exemple, si voleu fer una baixada d'iOS 15, només podeu tornar a la seva versió estable anterior, que està signada per Apple. Podeu visitar IPSW.me per comprovar si el microprogramari compatible està disponible.

1.4 Saber com baixar a una versió que ja no està signada per Apple (si cal)

Com ja sabeu, per baixar iOS 15, heu de fer els passos necessaris dins dels 14 dies posteriors al seu llançament oficial. A més, els usuaris només poden tornar a una versió estable anterior. Tanmateix, si heu superat la durada de 14 dies i voleu baixar a una versió que ja no està signada per Apple, heu d'utilitzar una eina de tercers. Amb l'ajuda d'eines com TinyUmbrella o TaigOne Downgrader, podeu instal·lar qualsevol versió d'iOS compatible al dispositiu. Imiten la signatura d'Apple, permetent-nos instal·lar firmware personalitzat (versió d'iOS) als iDevices.

Tot i que tot el procés seria força tècnic i potser no donaria resultats positius. Com que Apple no admet aquestes eines de tercers, heu de fer jailbreak al vostre dispositiu per fer-ho. Això no es recomana perquè afectarà la garantia del vostre dispositiu i ja no tindríeu accés a les versions oficials d'iOS. A més, farà que el vostre dispositiu sigui vulnerable a amenaces de seguretat no desitjades.

Part 2. Com baixar iOS 15 amb seguretat?

Ara, quan coneixeu tots els requisits previs per rebaixar iOS 15, podreu complir fàcilment els vostres requisits. Idealment, podeu utilitzar l'ajuda d'iTunes o de qualsevol altra eina de tercers per aprendre a baixar d'iOS 15. En qualsevol cas, assegureu-vos que hi hagi una còpia de seguretat del vostre dispositiu prèviament. Per facilitar-vos les coses, hem proporcionat dues solucions per fer una baixada d'iOS 15.

2.1 Solució amb un sol clic per baixar iOS 15

Passos per actualitzar a iOS 15:
  • Connecteu el vostre dispositiu iOS a l'ordinador i inicieu Dr.Fone.
  • Feu clic al mòdul "Reparació" i aneu a l'opció Reparació d'iOS.
  • Seleccioneu qualsevol dels modes i confirmeu la vostra elecció seleccionant la versió d'iOS que es mostra i feu clic a "Inici".
  • Sieu-vos i espereu una estona perquè l'aplicació començarà a descarregar el microprogramari compatible per al vostre dispositiu iOS.

    • Nota: si us plau, comproveu https://ipsw.me/product/iPhone per assegurar-vos que el microprogramari compatible estigui disponible abans de baixar.

drfone android box
Dr.Fone - Reparació del sistema (iOS)
  • Actualitzeu a iOS mostrant el firmware anterior.
  • També podeu actualitzar iOS als vostres iDevices.
  • Sense dependència d'iTunes.
  • Solucioneu tots els problemes del sistema iOS com la congelació d'iOS, el logotip blanc d'Apple, etc.
Get for PC Get for Mac

2.2 Anàmetre a la versió anterior d'iOS 15 mitjançant iTunes

Though, there are a lot of users who wish to take the assistance of iTunes to do the same. While you can perform iOS 15 downgrade with iTunes, it has its own cons. For instance, you might end up losing the existing data on your phone as it would restore your device to its factory settings. The process is also a bit technical, and you might end up damaging your device in the process.

What you need:
  • The latest version of iTunes
  • IPSW file you wish to install
Steps to downgrade iOS 15 with iTunes
  • Beforehand, Find my iPhone service on your device should be turned off. To do this, unlock it and go to its iCloud Settings > Find my iPhone to disable it. You need to enter your Apple ID and password to confirm this.
  • Now, connect your iOS device to the system and launch an updated version of iTunes on it. Click on the device icon and select your iPhone/iPad.
  • Go to its “Summary” tab and hold the Option Key (on Mac) or the Shift Key (on Windows) while clicking on the “Update” button.
  • This will open a browser window, letting you go to the location where the downloaded IPSW file is saved.
  • Select and load the IPSW file on iTunes and confirm your choice to forcefully update the connected device. Wait for a while and let iTunes complete the iOS 15 downgrade.
operate with itunes

Part 3. Best iOS 15 Downgrading Tools

As you can see, sometimes it can be tough to undo an iOS 15 update on iPhone or iPad. To make the entire process simpler, there are tons of third-party tools that you can try. Not only will they let you downgrade iOS version without losing data, but they would also yield better results. Also, if you have a jailbroken device, then you can even downgrade it to any previous iOS version. Let’s get to know more about the features and flexibility of some of these readily available tools.

3.1 Downgrading Tools for Common People (Fast & Easy to Use)

If you are a beginner and do not have a lot of technical knowledge about iOS downgrading, then consider picking either of the following tools.

3.2 Downgrading Tools for Tech-savvy Users (Complex But Can Achieve More)

If you want more flexibility with your device and have decent technical experience, then you can also explore some of these options too.

tips

What are SHSH blobs for iPhone?

Both SHSH and SHSH2 blobs are referred to digital signatures deployed by Apple on respective IPSW files. This protects the authenticity of the IPSW files and only signed software would be installed on the device. When Apple releases a new iOS version, it stops signing the previous version. In this way, users need to upgrade to the latest public iOS version. This is where previously saved SHSH blobs are used to forge these signatures in order to downgrade our devices.

Part 4. iOS 15 Downgrading Troubleshooting

4.1 iOS 15 Downgrade Failed Many Times

This is one of the most common issues that users face while downgrading their iOS devices. The chances are that while downgrading your device, the process would stop in between unexpectedly.

It happens when we try to downgrade the device to an incompatible iOS version. A faulty internet connection or low free space on the device can also trigger it.

Quick Fixes:
  • Check the iOS version: Needless to say, if you are trying to downgrade your device to an iOS version it no longer supports, then you might face unwanted issues. Ideally, you should try to downgrade iOS 15 to a previous version and not any other existing one.
  • Have a stable internet connection: An inconsistent internet connection is another prominent cause for this error. It happens when the download of the iOS update is halted in between (due to a poor connection). Therefore, make sure that the device stays connected to a working and fast internet connection for a seamless downgrading. You can go to your phone’s WiFi settings to further diagnose this.

4.2 iOS Stuck in Recovery/DFU Mode/Apple Logo

While downgrading your device, your phone might get stuck in the recovery mode, Apple logo, or the DFU mode screen. The situation might seem a bit tedious, but you can try to resolve it by forcefully restarting your phone in most of the cases.

Downgrading from an unstable version, the download process of the firmware update has been halted in between, or any other firmware related issue.

Quick Fixes:
  • Forcefully restart your device: By applying the correct key combinations, we can forcefully restart an iOS device and resolve this issue. Since it resets the current power cycle of the device, it is also known as a soft reset. If you own an iPhone 6s or an older generation phone, then long press the Power and Home button for at least 10 seconds. Users with an iPhone 7 or iPhone 7 Plus can press the Power and the Volume Down button. Keep pressing them until your phone restarts. For iPhone 8 and newer versions, you need to quick-press the Volume Up button first. Let it go and quick-press the Volume Down button. Subsequently, hold the Side button and let it go once the phone restarts.
  • Connect it to iTunes: In case if your phone is stuck in recovery or DFU mode, and you haven’t connected it to iTunes, then do the same. In no time, iTunes will automatically detect that your device is in the recovery mode and display the following prompt. Just confirm your choice and restore your device to factory settings to fix this.

4.3 iOS 15 Downgrade stuck on “Attempting data recovery”

The final step in the downgrading process is when the existing data on the device is recovered. Though, while doing so, the device might get stuck in the process and end up in the same loop.

An incompatible iOS version, loose connections, jailbroken device, lack of free storage, or any other related issue.

Quick Fixes:
  • Check whether your iPhone is jailbroken: Mostly, users get this error while performing iOS 15 downgrade on a jailbroken device. If your device is jailbroken, then you should not use iTunes to downgrade it. Instead, use a readily available tool like iFaith or TinyUmbrella to do the same.
  • Boot your iPhone in Recovery Mode: You can also take the assistance of iTunes and boot your device in the Recovery Mode to resolve this problem. To do this, just launch iTunes on your system and connect your phone to it. Now, using the correct key combinations, forcefully restart your device (already listed above). Subsequently, iTunes will detect as soon as your phone boots in the Recovery Mode. When you get the following prompt, click on the “Restore” button to reset your device.

4.4 iOS 15 Downgrade with iTunes won’t work

Most of the users take the assistance of iTunes (and an IPSW file) to downgrade iOS 15. Though, if there is a problem with the file, your device, or iTunes, then the process might not work.

An unsupported version of iTunes, corrupt IPSW file, or conflict with the device itself can result in this error.

Quick Fixes:
  • Check the IPSW file: Firstly, make sure that you have downloaded the correct IPSW file from a trusted source. Also, the IPSW file should be compatible with your iOS device else you might face this issue.
  • Disable Find my iPhone: Before you connect your device to iTunes, make sure that the Find my iPhone feature is disabled in it. To do this, go to its iCloud Settings > Find my iPhone and simply turn off this feature. This will not cause any conflict when you undo an iOS 15 update on iPhone.
  • Update iTunes: Needless to say, you should use an updated version of iTunes to downgrade iOS 15. Just launch iTunes on your system and go to Help > Check for Updates. This will make iTunes check for any available update. After finishing the update, you can restart your system and reconnect your device.

4.5 iPhone stuck in a loop trying to restore during downgrade

While restoring the device during the downgrading process, your device might get stuck. For instance, it can get stuck in a restart loop, not letting you access the device.

Lack of free space on the device, corrupt storage, incomplete update, bad IPSW file use, or any other compatibility issue.

Quick Fixes:
  • Force restart your device: This will reset the present power cycle of your device and will let you fix any minor issue related to it. To do this, you need to press certain keys on your device. We have already listed the correct key combinations to force restart a device in the previous sections.
  • Restart the process: If the downgrading process has been halted in between and your phone keeps restarting, then force restart it first. Now, connect it to iTunes or use any other third-party tool to undo an iOS 15 update on iPhone all over again.
  • Use a 3rd party tool: If nothing else seems to work, then consider using a dedicated iOS repairing tool like Dr.Fone - System Repair (iOS). It can fix all kinds of iOS and iTunes related issues without causing any harm to your device. Just launch the application and follow a simple click-through process to put your phone out of the loop and downgrade it to a stable iOS version.

4.6 iOS 15 Downgrade won’t work using SHSH

SHSH Blobs are Apple signatures that are needed to downgrade iOS 15 in a timely manner. Their absence or a wrong SHSH entity can tamper with the downgrading process.

Wrong SHSH blob, corrupt unit by a third-party dump, or an expired SHSH blob can be some of the major reasons for this.

Quick Fixes:
  • Use an SHSH blobs dumper: There are tons of readily available third-party SHSH dumpers (like iFaith) that you can try. Though, most of these applications will require a jailbroken device. You can simply connect your device or provide its model to obtain an ideal SHSH blob.
  • Obtain your device’s SHSH blob: You can connect your iPhone/iPad to the system and launch iTunes on it. Select your device and go to its Summary. Click on the “Serial Number” field a few times, till it displays the ECID number. Now, copy the ECID code and go to any online source to convert it into hexadecimal code.

4.7 Lost all data after iOS 15 Downgrade

This is one of the worst nightmares for any iOS user. After completing the downgrade, the chances are that you might end up losing all the saved photos, videos, contacts, messages, and other important files from your phone.

The process could be halted in between, a corrupt device, bad firmware, and so on. An upgrade to an unstable release of iOS can also cause data loss on your device.

Quick Fixes:
  • Use a data recovery tool ASAP: If you have suffered from an unwanted data loss on your device, then take the assistance of an iOS data recovery program . A part of the Dr.Fone toolkit, it is one of the first and the most successful data recovery tools for iOS devices. All you need to do is connect your device and launch the application. Follow a simple click-through process to extract all kinds of lost or deleted data from your device. The application will let you preview the extracted data, letting you selectively save it to the location of your choice.

4.8 Backup cannot be restored after iOS 15 downgrade

Even after losing their data while downgrading an iOS device, users try to restore an existing backup. Sadly, there are times when the previous iTunes or iCloud backup ceases to restore on the downgraded device.

The problem usually occurs due to a compatibility issue among various iOS versions. For instance, you could have taken the backup of your device when it was running on another iOS version and now you are trying to restore it on an unsupported iOS version.

Quick Fixes:
  • You can load a previous iTunes or iCloud backup using a iOS restoring tool and even preview its data on its interface. For instance, to restore an iCloud backup, you simply need to log-in to your iCloud account. The application will list the available backup files for you pick an ideal option. In this way, you can easily restore your data without erasing the existing content on your device.

Part 5. FAQs about iOS 15 Downgrade

Yes, you can downgrade iOS to a previous version signed by Apple. Users get 14 days after a public official release to do it. If you have upgraded your device to a version, then you can downgrade to a stable version easily (until 14 days after the release of its stable version).

There are all kinds of ways to undo an iOS 15 update on iPhone. If you want, you can take the assistance of iTunes to do the same. Though, to downgrade iOS 15 without losing data, consider using a more sophisticated tool like Dr.Fone - System Repair (iOS). In case if you have a jailbroken device, then you can even give tools like TinyUmbrella a go.

When we install an iOS version on the device, the Apple server asks for a digital signature to authenticate it. A signed IPSW file would have a verified signature issued by Apple, letting us upgrade/downgrade the device without any hassle. Therefore, if an IPSW file is not signed by Apple, then it will not be recognized by the server and the upgrading/downgrading process won’t be completed.

There are all kinds of SHSH dumps and readily available third-party tools that can help us force Apple’s signature and create SHSH blobs even after Apple stops signing them. Though, you should know that Apple might revoke the authentication of such SHSH blobs anytime. To do this, you need to have a jailbroken device and use a dedicated tool like iFaith or FutureRestore.

The Apple Software Program lets us test the releases of iOS before the public availability. You can join or leave the program anytime you want without spending anything. If you want to leave it, then go to the Unenroll section of the website.

apple beta program

Ideally, you can’t downgrade your device to an unsigned iOS version. This is because the Apple server won’t authenticate your downloading request without a valid SHSH blob. That is why users take the assistance of a previously saved SHSH blob to do the same. You can also use a third-party downgrading tool to do it as well.

After downgrading an iOS update, you might find an existing software profile on your device storage. To remove this, just go to your device’s Settings > General > Profile and select the iOS profile from here. Tap on the “Delete Profile” option and confirm your choice to remove it.

You can restore a previously stored SHSH blob from your device or forge Apple’s signature. There are a few third-party tools like FutureRestore that can help you do the same. You can also choose to dump your SHSH blobs in order to use them afterward. Though, in most of the cases, users have to jailbreak their device in order to do it.