Sony Ericsson Xperia acro S (semc-hikari)
Nothing so far.
What does not work
Unfortunately this device uses a non-standard ELF format boot.img file that is not supported by postmarketOS (yet):
% file boot.img boot.img: ELF 32-bit LSB executable, ARM, version 1 (ARM), statically linked, corrupted section header size
How to enter flash mode
Power off the device. Hold Volume Up as you plug the USB cable into the device.