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--- doc:appunti:hardware:xiaomi_mi_a1 [2020/09/23 16:09] – [August 2020 security update] niccolo
+++ doc:appunti:hardware:xiaomi_mi_a1 [2020/09/23 17:06] (current) – [August 2020 security update] niccolo
@@ Line 393: / Line 393: @@
 ===== August 2020 security update =====
-This is a new update from Xiaomi, still featuring **AndroidOne v.9** relase, build **PKQ1.180917.001.V10.0.24.0.PDHMIXM**.
+This is a new update from Xiaomi, still featuring **AndroidOne v.9** relase, build **PKQ1.180917.001.V10.0.24.0.PDHMIXM**. The upgrade was downloaded nightly over the WiFi. It seems impossibile to prevent such automatic download: I did not find any settings to prevent automatic upgrade download. After downloading, the phone asks to reboot to complete the upgrade.
+The starting conditions were:
+  * A/B System Updates status: **Current Slot: ?** (may be it was **A**, because after installation it is **B**).
+  * Bootloader is **unlocked**.
+  * **Magisk** and **TWRP** were installed, but may be they were hidden by accident. Infact the installation of the upgrade went OK after a reboot, whereas it should fail because the boot sector is tampered with **Magisk su**.
+  * **System partition** was the stock one: root privileges were never used to tamper the **/system** hierarchy.
+After the upgrade, I did the following to get **root again**:
+  * adb reboot bootloader
+  * fastboot boot twrp-3.3.0-2-tissot.img
+  * Verified from TWRP => Reboot: **Current slot: B**
+  * adb pull /dev/block/mmcblk0p22 boot_a.img
+  * adb pull /dev/block/mmcblk0p23 boot_b.img
+  * TWRP ⇒ Install ⇒ **twrp-installer-3.3.0-2-tissot.zip**\\ Running boot image patcher on slot a and b.
+  * system reboot
+  * adb reboot bootloader
+  * fastboot boot twrp-3.3.0-2-tissot.img
+  * TWRP ⇒ Install ⇒ **Magisk-v20.4.zip**\\ Current boot slot: _b, unpacking, patching, repacking, flashing new boot image.
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