How to Update to iOS 15
نحوه به روز رسانی به iOS 15
iOS 15 Update Problem
مشکلات آپدیت iOS 15
How to Downgrade
نحوه تنزل رتبه

کاهش رتبه iOS 15: چگونه این کار را ایمن و آسان انجام دهیم

• برای تنزل رتبه آماده شوید
• نحوه دانگرید iOS 15
• انتخاب ابزار کاهش رتبه iOS 15
• رفع مشکل را کاهش دهید
• سوالات متداول کاهش رتبه iOS 15

قسمت 1. آیا به خوبی برای iOS 15 downgrade? آماده هستید؟

آخرین به روز رسانی iOS منتشر شده است، اما کاربران در حال حاضر از برخی از اشکالات آن شکایت دارند. برای غلبه بر این مشکلات، ممکن است در نظر داشته باشید که iOS 15 را کاهش دهید. اگرچه، شما باید یک قدم به عقب بردارید و عواقب آن را درک کنید. به عنوان مثال، کاهش رتبه ممکن است تمام داده‌های موجود در تلفن شما از جمله عکس‌ها، برنامه‌ها، مخاطبین و غیره را پاک کند. بنابراین، مهم است که قبل از لغو به‌روزرسانی iOS 15 در آیفون، اقدامات احتیاطی لازم را انجام دهید.

1.1 از دستگاه خود نسخه پشتیبان تهیه کنید

این مهمترین چیزی است که باید قبل از دانگرید iOS 15 به نسخه پایدار قبلی به آن توجه کنید. وقتی یک دستگاه iOS را دانگرید می کنیم، ممکن است تمام داده های ذخیره شده در آن حذف شود. از فایل‌های رسانه‌ای گرفته تا داده‌های برنامه - ممکن است در این فرآیند تمام محتوای موجود در تلفن خود را از دست بدهید. بنابراین، بهترین راه برای یادگیری دانگرید از iOS 15 به نسخه پایدار، گرفتن نسخه پشتیبان از گوشی شما است. به این ترتیب پس از اتمام دانگرید، به راحتی می توانید با بازگردانی نسخه پشتیبان، اطلاعات مهم خود را بازیابی کنید.
پشتیبان گیری از iDevice با Dr.Fone
  • 1آیفون یا آیپد خود را به کامپیوتر وصل کنید.
  • 2نوع داده را دستی انتخاب کنید یا همه را انتخاب کنید.
  • 3برای پشتیبان گیری از داده های دستگاه به صورت محلی، روی دکمه "پشتیبان گیری" کلیک کنید.
ویژگی های منحصر به فرد:
  • •از کل دستگاه iOS، از جمله مخاطبین، گزارش تماس‌ها، پیام‌ها، عکس‌ها، ویدیوها و غیره پشتیبان‌گیری کنید.
  • •بدون مشکل سازگاری، از یک دستگاه به دستگاه دیگر (یا یک نسخه iOS به نسخه دیگر) پشتیبان تهیه و بازیابی کنید.
  • •یک نسخه پشتیبان iCloud یا iTunes موجود را استخراج کرده و آن را به دستگاه مورد نظر خود بازیابی کنید.
  • •پیش نمایش داده ها از یک فایل پشتیبان برای بازیابی انتخابی آن. هنگام بازیابی نسخه پشتیبان، داده های موجود حفظ می شوند.
دانلود دانلود

پشتیبان گیری iDevice با iTunes

  • 1یک نسخه به روز iTunes را راه اندازی کنید و دستگاه iOS را به آن متصل کنید.
  • 2به تب “Summary” آن بروید و گزینه مربوطه را در زیر تب “Backups” پیدا کنید.
  • 3برای ذخیره نسخه پشتیبان از دستگاه خود، روی دکمه "Back Up Now" کلیک کنید.
موارد قابل توجه:
  • •iTunes نمی تواند نسخه پشتیبان نسخه بالاتر از نسخه پایین تر را بازیابی کند. بنابراین باید قبل از ارتقای دستگاه خود به iOS 15 یک نسخه پشتیبان تهیه کنید.
  • •هیچ شرطی برای پیش نمایش داده ها و بازیابی انتخابی آنها وجود ندارد.
  • •iTunes هنگام بازیابی یک نسخه پشتیبان، اطلاعات موجود در آیفون شما را پاک می کند.
اکنون iTunes را دریافت کنید

1.2 محدودیت زمانی برای دانگرید iOS را درک کنید

کل فرآیند دانگرید نسخه iOS به زمان حساس است، که بسیاری از کاربران از آن آگاه نیستند. بیایید در مورد این با جزئیات صحبت کنیم.

  • اگر نسخه بتای iOS را نصب کرده‌اید، می‌توانید هر زمان که بخواهید نسخه بتای iOS را به نسخه پایدار قبلی کاهش دهید (تا زمانی که نسخه عمومی رسمی iOS منتشر شود).
  • پس از انتشار نسخه عمومی پایدار iOS، فقط 14 روز فرصت دارید تا دستگاه خود را به نسخه قبلی iOS موجود کاهش دهید.

1.3 نسخه صحیح را برای دانگرید از iOS 15 انتخاب کنید

در حالت ایده‌آل، فقط می‌توانید iOS 15 را فقط به نسخه پایدار قبلی کاهش دهید. برای مثال، اگر می‌خواهید iOS 15 را کاهش دهید، فقط می‌توانید به نسخه پایدار قبلی آن که توسط اپل امضا شده است، بازگردید. برای بررسی اینکه آیا سفت‌افزار سازگار در دسترس است، می‌توانید از IPSW.me دیدن کنید.

1.4 نحوه دانگرید کردن را به نسخه ای که دیگر توسط اپل امضا نشده است را بدانید (در صورت لزوم)

همانطور که می دانید، برای دانگرید iOS 15، باید طی 14 روز پس از انتشار رسمی، اقدامات لازم را انجام دهید. همچنین، کاربران فقط می توانند به نسخه پایدار قبلی برگردند. اگرچه، اگر مدت 14 روز را پشت سر گذاشته‌اید و می‌خواهید به نسخه‌ای که دیگر توسط اپل امضا نشده است، ارتقا دهید، باید از ابزار شخص ثالث استفاده کنید. با استفاده از ابزارهایی مانند TinyUmbrella یا TaigOne Downgrader، می توانید هر نسخه iOS پشتیبانی شده را روی دستگاه نصب کنید. آنها امضای اپل را تقلید می کنند و به ما اجازه می دهند سیستم عامل شخصی سازی شده (نسخه iOS) را روی iDevices نصب کنیم.

اگرچه کل فرآیند بسیار فنی خواهد بود و ممکن است نتایج مثبتی به همراه نداشته باشد. از آنجایی که این ابزارهای شخص ثالث توسط اپل پشتیبانی نمی شوند، برای انجام این کار باید دستگاه خود را جیلبریک کنید. این توصیه نمی شود زیرا بر ضمانت دستگاه شما تأثیر می گذارد و دیگر به نسخه های رسمی iOS نیز دسترسی نخواهید داشت. علاوه بر این، دستگاه شما را در برابر تهدیدات امنیتی ناخواسته آسیب پذیر می کند.

قسمت 2. نحوه دانگرید iOS 15 Safely?

اکنون که از تمام پیش نیازهای پایین‌آوری iOS 15 آگاه هستید، می‌توانید به راحتی نیازهای خود را برآورده کنید. در حالت ایده‌آل، می‌توانید از کمک iTunes یا هر ابزار شخص ثالث دیگری برای یادگیری نحوه دانگرید از iOS 15 استفاده کنید. در هر صورت، مطمئن شوید که یک نسخه پشتیبان از دستگاه شما از قبل نگهداری شده است. برای اینکه کارها را برای شما آسانتر کنیم، دو راه حل برای انجام دانگرید iOS 15 ارائه کرده ایم.

2.1 راه حل با یک کلیک برای کاهش رتبه iOS 15

مراحل به روز رسانی به iOS 15:
  • دستگاه iOS خود را به رایانه شخصی متصل کنید و Dr.Fone را راه اندازی کنید.
  • روی ماژول “Repair” کلیک کنید و به گزینه iOS Repair بروید.
  • هر یک از حالت ها را انتخاب کنید و با انتخاب نسخه نمایش داده شده iOS انتخاب خود را تأیید کنید و روی "شروع" کلیک کنید.
  • بنشینید و مدتی منتظر بمانید زیرا برنامه شروع به دانلود سیستم عامل سازگار برای دستگاه iOS شما می کند.

    • توجه: لطفاً https://ipsw.me/product/iPhone را بررسی کنید تا مطمئن شوید که سفت‌افزار سازگار قبل از ارتقا در دسترس است.

drfone android box
Dr.Fone - تعمیر سیستم (iOS)
  • با فلش کردن سیستم عامل قبلی به iOS آپدیت کنید.
  • همچنین می تواند iOS را در آی دیوایس های شما به روز کند.
  • بدون وابستگی به iTunes
  • رفع تمام مشکلات سیستم iOS مانند انجماد iOS، لوگوی سفید اپل و غیره.
دریافت برای کامپیوتر دریافت برای مک

2.2 iOS 15 را با استفاده از iTunes کاهش دهید

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.