Please, before posting, we’ve seen a lot of these post saying X instance is down right now, or “is X instance down?”. The answer is probably, but it’s probably because Lemmy v0.19 dropped and it includes some downtime, upwards of an hour for all the migrations to finish.
Please, hold off on asking/posting for an hour or so. Your sysadmins are waiting for it to come back online.
Jerboa v54 or later works on v17 Lemmy for me. You may need to clear data, logout and login for it to work. For other apps the process is likely similar.
Liftoff stopped working for Lemm.ee for me but not Lemmy.world so it must have been upgrade related. I couldn’t figure out how to fix it so I’m just switching to Connect, ha.