Sony Xperia XA Ultra (sony-ukulele)

How to enter flash mode

 * 1) Power off: + until device vibrates three times
 * 2) Connect usb cable to computer
 * 3) Press and hold
 * 4) Connect usb cable to phone
 * 5) Hold  until led turns blue
 * 6) Fastboot mode is now active

Installation

 * 1) pmbootstrap init, select sony-ukulele, answer questions
 * 2) pmbootstrap install
 * 3) pmbootstrap flash_rootfs
 * 4) pmbootstrap flash_kernel

Touchscreen
Touchscreen is apparently some ELAN model. The driver is included in the vendor kernel at. It seems to work correctly with postmarketOS userspace.

Display
Without including msm-fb-refresher package, weston gui booted successfully and the desktop environment and postmarketOS demos menu were shows correctly. However, the screen was not updating at all, resulting in apparent nonresposiveness to touch and frozen datetime. Adding msm-fb-refresher solved the issue.