Differences

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--- doc:appunti:hardware:xiaomi_mi_a1 [2019/11/08 16:56] – [The OTA Update] niccolo
+++ doc:appunti:hardware:xiaomi_mi_a1 [2019/11/09 12:44] – [Install the TWRP Recovery] niccolo
@@ Line 68: / Line 68: @@
 <code>
 adb shell
-tissot_sprout:/ find /dev -name 'by-name' 2> /dev/null
+tissot_sprout:/ $ ls -l /dev/block/bootdevice/
-/dev/block/platform/soc/7824900.sdhci/by-name
-cd /dev/block/platform/soc/7824900.sdhci/by-name
-ls -l
 ...
 lrwxrwxrwx 1 root root 21 1970-07-10 05:23 boot_a -> /dev/block/mmcblk0p22
@@ Line 78: / Line 75: @@
 </code>
-The meaning is: search into **/dev/** for a directory named "**by-name**", look for the names **boot_a** and **boot_b** and take note of the actual partition names. You can see also that the **recovery** name does not exists.
+The meaning is: search into **/dev/block/bootdevice/** for symbolic links **boot_a** and **boot_b** and take note of the actual partition names. You can see also that the **recovery** name does not exists.
 Now we need to **boot** into an environment where we have **root privileges**, otherwise we cannot read the entire partitions. This means booting into the **Fastboot Mode** bootloader and load and run the TWRP Recovery program.
@@ Line 127: / Line 124: @@
   * **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: plenty of pop-up with **Android Phone force close**, pop-up for **Factory reset**, boot loop, etc. May be the Slot A contained the boot code for Android 8.0.0, whereas my phone already had received 8.1.0. Fortunately enough I was able to ''adb reboot bootloader'' and switch again to Slot B.
   * **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 (//**Developer options are not available for this user**//), the top **status bar did not swipe** down, etc. I had to **Factory reset** the phone!
+  * **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 (//**Developer options are not available for this user**//), the top **status bar did not swipe** down, etc. I had to **Factory reset** the phone (see a possible fix for this problem here: [[xiaomi_mi_a1_home_key_problem]]).
 ==== Install Magisk, the SuperUser Tool ====
@@ Line 164: / Line 161: @@
 ===== Fastboot Mode =====
-Once in Recovery Menu, you can boot into the **Fastboot Mode** using the menu entry //Reboot to bootloader//. Otherwise you can execute the **adb** command on a PC when the phone is booted normally and connected via the USB cable (it is required to enable //USB debugging// on the phone and to authorize the PC on the phone pop-up, once connected):
+In Android, **fastboot** is a special diagnostic protocol that you can boot your Android device into. While in fastboot, you can modify the file system images from a computer over a USB connection.
-<code>
+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 //USB debugging// on the phone and to authorize the PC on the phone pop-up, once connected.
+  * 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:
 {{.:android:mi-a1-fastboot-log.jpg?direct&200|Mi-A1 Fastboot Logo}}
+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, e.g. the command ''fastboot set_active b'' does not work on the Mi A1.
+Here are some commands that can be used in fastboot mode:
 <code>
-adb devices
+fastboot help
-List of devices attached
+fastboot devices
-d99913    device
+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
 </code>