doc:appunti:hardware:xiaomi_mi_a1
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doc:appunti:hardware:xiaomi_mi_a1 [2019/05/16 12:14] – [Xiaomi Mi A1 Android Phone] niccolo | doc:appunti:hardware:xiaomi_mi_a1 [2019/11/09 06:54] – [Fastboot Mode] niccolo | ||
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^ Connector | ^ Connector | ||
^ Audio jack | 3.5 mm | | ^ Audio jack | 3.5 mm | | ||
+ | ^ A/B (Seamless) System Updates | ||
===== How to Gain root Privileges ===== | ===== How to Gain root Privileges ===== | ||
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< | < | ||
adb shell | adb shell | ||
- | tissot_sprout:/ | + | tissot_sprout:/ |
- | /dev/block/platform/soc/ | + | |
- | cd / | + | |
- | ls -l | + | |
... | ... | ||
lrwxrwxrwx 1 root root 21 1970-07-10 05:23 boot_a -> / | lrwxrwxrwx 1 root root 21 1970-07-10 05:23 boot_a -> / | ||
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</ | </ | ||
- | The meaning is: search into **/dev/** for a directory named " | + | The meaning is: search into **/dev/ |
Now we need to **boot** into an environment where we have **root privileges**, | Now we need to **boot** into an environment where we have **root privileges**, | ||
< | < | ||
- | adb reboot-bootloader | + | adb reboot bootloader |
</ | </ | ||
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< | < | ||
- | adb reboot-bootloader | + | adb reboot bootloader |
fastboot boot recovery-3.2.1-2-oreo.img | fastboot boot recovery-3.2.1-2-oreo.img | ||
</ | </ | ||
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{{ .: | {{ .: | ||
- | * **Do not swap Slot A and Slot B**. Some recipes found on the internet say to do that in TWRP (it is from the Reboot menu). I tried it and it was a nightmare! The Reboot menu was stating that the Slot B were active, so I switched to Slot A and installed TWRP. At the next reboot I got a non-working environment: | + | * **Do not swap Slot A and Slot B**. Some recipes found on the internet say to do that in TWRP (it is from the Reboot menu). I tried it and it was a nightmare! The Reboot menu was stating that the Slot B were active, so I switched to Slot A and installed TWRP. At the next reboot I got a non-working environment: |
* **Do not veryfy the ZIP archive**. The archive does not have the required info to check. | * **Do not veryfy the ZIP archive**. The archive does not have the required info to check. | ||
* **Do not wipe the Dalvik cache after the install**. Don't know if it was the culprit, but after installing TWRP, I clicked the button to wipe Dalvik cache, at the next reboot I had a damaged system. The **home button did not work**, the Developer options were no longer availables (// | * **Do not wipe the Dalvik cache after the install**. Don't know if it was the culprit, but after installing TWRP, I clicked the button to wipe Dalvik cache, at the next reboot I had a damaged system. The **home button did not work**, the Developer options were no longer availables (// | ||
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{{ .: | {{ .: | ||
- | When rooting an Android device we generally need the **su** binary program (the actual Unix tool used to switch from normal user to root), plus an **app to manage superuser permissions** granted (or denied) to other applications. Historically the most known app for this purpose was **SuperSU** by Chainfire, but something changed. Chainfire [[https:// | + | When rooting an Android device we generally need the **su** binary program (the actual Unix tool used to switch from normal user to root), plus an **app to manage superuser permissions** granted (or denied) to other applications. Historically the most known app for this purpose was **SuperSU** by Chainfire, but something changed. Chainfire [[https:// |
- | The first step is to install the ZIP archive which provides the **su** binary, we already copied the **Magisk-v17.3.zip** file to the phone storag. Let's reboot into TWRP Recovery executing from the connected PC the following command: | + | The first step is to install the ZIP archive which provides the **su** binary, we already copied the **Magisk-v17.3.zip** file to the phone storage. Let's reboot into TWRP Recovery executing from the connected PC the following command: |
< | < | ||
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===== Fastboot Mode ===== | ===== Fastboot Mode ===== | ||
- | Once in Recovery Menu, you can boot into the **Fastboot Mode** using the menu entry //Reboot to bootloader// | + | In Android, **fastboot** is a special diagnostic protocol that you can boot your Android device |
- | < | + | You can start fastboot mode in severl ways: |
- | adb reboot bootloader | + | |
- | </code> | + | * Power off the phone, then press **VolumeDown + Power** buttons together, untill vibration. |
+ | * Executing the **adb reboot bootloader** command on a PC when the phone is booted normally and connected via the USB cable. It is required to enable | ||
+ | * From the **stock Recovery** menu, choosing the entry **Reboot to bootloader**. | ||
+ | * From the **TWRP Recovery**, choosing **Reboot** menu, then **Bootloader**. | ||
+ | |||
+ | The Xiaomi Mi A1 will show the following image when in fastboot mode: | ||
{{.: | {{.: | ||
+ | |||
+ | To control the fastboot mode of the phone, you have to install the **fastboot** command on your PC. On a Debian GNU/Linux install the **fastboot 8.1.0** package. **NOTICE**: Version 7.0.0 is not reccomended, | ||
+ | |||
+ | Here are some commands that can be used in fastboot mode: | ||
< | < | ||
- | adb devices | + | fastboot help |
- | List of devices | + | fastboot |
- | 574524d99913 | + | fastboot boot recovery-3.2.1-2-oreo.img |
+ | fastboot flash boot_b boot_b.img | ||
+ | fastboot oem unlock | ||
+ | fastboot set_active b | ||
+ | fastboot reboot | ||
</ | </ | ||
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===== Upgrading Android maintaining root privileges ===== | ===== Upgrading Android maintaining root privileges ===== | ||
- | In April 2019 my phone still was running the following: | + | In November |
* **Android 8.1.0** - Patch 2018-10-05 | * **Android 8.1.0** - Patch 2018-10-05 | ||
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* **TWRP 3.2.1-2** | * **TWRP 3.2.1-2** | ||
- | MagiskManager warns about the availability of **Magisk | + | MagiskManager warns about the availability of **Magisk |
==== Upgrade Magisk and MagiskManager ==== | ==== Upgrade Magisk and MagiskManager ==== | ||
- | - Copy the **[[https:// | + | - Copy the **[[https:// |
+ | - Copy the **[[https:// | ||
- Reboot into TWRP recovery. I used the **adb reboot recovery** command from the PC, but you can use the **VolumeUp + Power** trick. | - Reboot into TWRP recovery. I used the **adb reboot recovery** command from the PC, but you can use the **VolumeUp + Power** trick. | ||
- | - From the TWRP menu, choose **Install** and search for the Magisk-v19.0.zip archive. | + | - From the TWRP menu, choose **Install** and search for the Magisk-v20.1.zip archive. |
- I choosed not to verify the zip archive and not to reboot the phone, so I had time to read the output of the command. Everything seemed OK, so I finally **rebooted**. | - I choosed not to verify the zip archive and not to reboot the phone, so I had time to read the output of the command. Everything seemed OK, so I finally **rebooted**. | ||
- | - Once rebooted in normal system, | + | - Once rebooted in normal system, |
+ | |||
+ | ==== Upgrading the Operating System ==== | ||
+ | |||
+ | The phone automatically warns about the availability of an **OTA (On The Air) Upgrade**. You can also check for upgrades availability by tapping | ||
+ | |||
+ | If you allow downloading and installing the upgrade, a check will be performed about the **integrity** of the **boot image** and the **system image**, before the actual install. The check will fail and the upgrade will be aborted if one of this condition is true: | ||
+ | |||
+ | | ||
+ | | ||
+ | |||
+ | The upgrade process will fail with a warning message | ||
+ | |||
+ | To rescue from the first condition, it is sufficient to restore the boot partition from the original backup. You will loose root and TWRP Recovery, but you can reinstall them after the upgrade. If you have just installed | ||
+ | |||
+ | < | ||
+ | adb reboot bootloader | ||
+ | fastboot flash boot_b boot_b.img | ||
+ | fastboot reboot | ||
+ | </ | ||
+ | |||
+ | Allow upgrading after tampering the /system partition is more painful; yuo have to restore the full system by flashing the original ROM (so loosing all your data, apps and settings), then you will allow the update to install, and restore all your customization. | ||
+ | |||
+ | ==== The OTA Update ==== | ||
+ | |||
+ | When the phone downloads an OTA upgrade, it will save it into the **/ | ||
+ | |||
+ | The file is actualy a Jar archive. The jar executable is provided by the Debian package **openjdk-8-jdk-headless** (or whatever version of Java you have), and you can use it in this way: | ||
+ | |||
+ | < | ||
+ | mkdir update | ||
+ | cd update | ||
+ | jar -xf ../ | ||
+ | </ | ||
- | FIXME Write how to complete | + | The main content is a **payload.bin**, |
- | * Backup **boot_a** and **boot_b** | ||
- | * Allow the system to **update**. FIXME Does it complete or will fail? May be it detects that the system was rooted and it will refuse. | ||
- | * Eventually re-install **TWRP** and **Magisk**. FIXME Does the upgrade switch from boot_b to boot_a partition? If such case, we should to reinstall TWRP and eventually Magisk. | ||
===== Web References ===== | ===== Web References ===== | ||
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* [[https:// | * [[https:// | ||
* [[https:// | * [[https:// | ||
+ | * [[https:// | ||
* [[https:// | * [[https:// | ||
* [[https:// | * [[https:// |
doc/appunti/hardware/xiaomi_mi_a1.txt · Last modified: 2020/09/23 17:06 by niccolo