Differences

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--- doc:appunti:hardware:xiaomi_mi_a1 [2019/04/12 11:40] – [How to Gain root Privileges] niccolo
+++ doc:appunti:hardware:xiaomi_mi_a1 [2019/05/19 19:46] – [Install Magisk, the SuperUser Tool] niccolo
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 ====== Xiaomi Mi A1 Android Phone ======
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 ^ RAM              | 3.8 Gb  |
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 ^ Connector        | USB Type C  |
 ^ Audio jack       | 3.5 mm  |
+^ A/B (Seamless) System Updates  | Yes  |
 ===== How to Gain root Privileges =====
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 Once that TWRP is started on the phone, swipe to allow writing to the partitions, then choose **Install** and browse to the **Twrp-recoveryInstaller-3.2.1-2-oreo.zip** archive.
-After the installation, the procedure will ask us if we want to **install the TWRP App**. You can answer yes, but it is not strictly required, the TWRP Recovery is a stand-alone program, it runs when requested without an underlying Android system and it does not require any App. The TWRP App may be used to install or upgrade the TWRP Recovery and to backup the existing Recovery, but it seems that the current version (1.19) is not able to handle the **A/B system updates** mechanism, it searches for the **recovery partition**, which **does not exist** in Xiaomi Mi A1 Oreo 8.1.0. So it's best not to use it.
+After the installation, the procedure will ask us if we want to **install the TWRP App**, we answered **no**.You can answer yes, but it is not strictly required, the TWRP Recovery is a stand-alone program, it runs when requested without an underlying Android system and it does not require any App. The TWRP App may be used to install or upgrade the TWRP Recovery and to backup the existing Recovery, but it seems that the current version (1.19) is not able to handle the **A/B system updates** mechanism, it searches for the **recovery partition**, which **does not exist** in Xiaomi Mi A1 Oreo 8.1.0. So it's best not to use it.
 Beware of this:
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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://plus.google.com/+Chainfire/posts/6Sp6t9LxtQZ|retired from SuperSU development]] in October 2017 and new protecting schemas were introduced by Google into Android, mainly **[[https://developer.android.com/training/safetynet/|SafetyNet]]** and **[[https://source.android.com/security/verifiedboot/dm-verity|dm-verity]]**. The new leading-edge app for su management appears to be **Magisk**.
-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:
 <code>
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 FIXME Write how to complete the upgrade!
+  * 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 =====