Exactly, just flash the LOS 18.1 boot image while in bootloader mode, then the following should work to enter recovery (at least it does on my castor_windy):
- Make sure the USB cable is disconnected
- Make sure the device is powered off
- You can hold Vol+ and Power for 3 seconds to force power off (confirmed by 3 vibrations)
- Turn the device on normally, pressing the Power button
- As soon as the LED turns green, briefly press Vol+ once: the LED will turn blue
- You should see the recovery splash screen instead of the standard boot animation within seconds
We all did, at some point.
Just run the latest version of XperiFirm separately. Make sure you choose the correct variant: castor_windy (Wi-Fi only) can be SGP511 (16 GB) or SGP512 (32 GB). Might need to uncheck Unpack firmware automatically in the settings, I think FlashTool expects an .ftf file.
4) FIRMWARE NUMBER AND USB DEBUGGING
On tablet, go to Menu > Settings > About tablet > Build number
Make sure it is 23.5.A.1.291 and tap 7 times on it to unlock Developer options.
If not 23.5.A.1.291, go to Menu > Settings > About tablet > Software update > System updates tab
XperiFirm is for downloading. Flashing is generally done with Newflasher these days but that's for newer devices. This is an older one, so FlashTool has to be used.
Good point. The latest firmware is exploitable with Dirty Cow, so the keys can be backed up easily before unlocking the bootloader: https://forum.xda-developers.com/t/universal-dirtycow-based-ta-backup-v2.3514236/ Not sure if it makes much difference in practice though. Unless I'm not up to date, restoring the TA partition on this device relocks the bootloader, so the backup would only be useful if you wanted to go back to stock firmware.
If you don't know LineageOS and would like to read about it before installing it you can take a look at the official Website.
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