doc: update installation readme (#228)

Author: pixincreate

README.md

@@ -159,19 +159,13 @@ It is easier to use the web installer to flash GrapheneOS. However, it is recomm
    fastboot flash avb_custom_key /path/to/avb_pkmd.bin
    ```
 
-5. **[Optional]** Before locking the bootloader, reboot into Android to confirm proper signing.
-
-   Install the Magisk or KernelSU app and run:
-
-   ```shell
-   adb shell su -c 'dmesg | grep libfs_avb'
-   ```
-
-   If AVB is working, you should see:
-
-   ```shell
-   init: [libfs_avb]Returning avb_handle with status: Success
-   ```
+5. Sideload the OTA (This avoids / reduces the possibility of running into `Device is corrupt. It can't be trusted` error)
+   5.1. Run `fastboot reboot recovery` to get into recovery mode
+   5.2. Android icon lying down with the text `No command"` should be visible on the screen
+   Hold the power button and press the volume up button a single time to get into the recovery UI
+   5.3. Using volume buttons, navigate to `Apply update from ADB` and select it with the power button
+   5.4. As the recovery prompt says, use `adb sideload <path to ota zip>` to sideload the OTA
+   5.5. Post sideload, select reboot to bootloader
 
 6. Reboot into fastboot and lock the bootloader. This will trigger a data wipe.
 

docs/FAQ.md

@@ -11,7 +11,7 @@
 ### I'm getting an error on boot saying `Device is corrupt. It can't be trusted`. What can I do? What are my options?
 
 - Flash the OTA, switch partitions, flash it again. Then sideload the OTA on both partitions *before* flashing custom keys (see farewelltospring's [comment](https://github.com/schnatterer/rooted-graphene/issues/96#issuecomment-2986363782) in [#96](https://github.com/schnatterer/rooted-graphene/issues/96) for details).
-- See [#89](https://github.com/schnatterer/rooted-graphene/issues/89) and [#96](https://github.com/schnatterer/rooted-graphene/issues/96) for details. 
+- See [#89](https://github.com/schnatterer/rooted-graphene/issues/89) and [#96](https://github.com/schnatterer/rooted-graphene/issues/96) for details.
 
 ### Root does not seem to exist after update