‘Cache wipe complete’. Tried adb sideload of 2.6.4-t again but still same as before.
Tried TWRP 3.3 and 3.7 for the S9 using Odin3, then adb sideload in TWRP, according to [HOWTO] Install /e/ on a Samsung smartphone with Windows easily
TWRP ‘could not decrypt data’.
Still same problem unfortunately…