Add instructions for Android GSI ROM

pages/05.other/android/gsi/default.en.md

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+---
+title: GSI
+visible: true
+---
+
+[toc]
+
+## Devices
+
+This is a list of my own devices using a GSI ROM.
+
+| Device           | Notes                                        |
+| ---------------- | -------------------------------------------- |
+| Xiaoxin Pad 2022 | Only system_b works, system_a is not present |
+
+## Installation
+
+1. Open a terminal and type `adb reboot bootloader`
+2. After bootloader is up. Type `fastboot devices` to check if your device is found properly.
+3. Type `fastboot flashing unlock` **WARNING: User data will be deleted with this step**
+4. Type `fastboot reboot fastboot` to launch into standalone fastboot mode
+5. Navigate to the folder where `vbmeta.img` and `boot.img` are saved
+   `fastboot flash --disable-verity --disable-verification vbmeta vbmeta.img`
+   `fastboot flash --disable-verity --disable-verification boot boot.img`
+6. Get the currently active system slot `fastboot getvar current-slot`
+   - Change the slot using `fastboot --set-active=a/b`
+7. Type `fastboot delete-logical-partition product_a` then `fastboot delete-logical-partition product_b`
+8. Last step install GSI with `fastboot flash system [image].img`
+
+> [XDA Thread on GSI with Lenovo Tab M10 Plus 3rd Gen](https://xdaforums.com/t/installing-custom-rom-gsi-magisk-on-lenovo-tab-m10-plus-3rd-gen-tb-125fu.4480023/)
+
+## Updating
+
+1. Open a terminal and execute `adb reboot bootloader`
+2. `fastboot reboot fastboot`
+3. `fastboot getvar current-slot`
+4. Change slot to the inactive one: `fastboot --set-active=a/b`
+5. `fastboot flash system [image].img`
+6. `fastboot reboot`
+7. Open Magisk and direct install
+8. Reboot
+
+## Wipe everything
+
+1. Open a terminal and execute `adb reboot bootloader`
+2. `fastboot reboot fastboot`
+
+`fastboot erase system_a`  
+`fastboot erase system_b`  
+`fastboot erase userdata`