Chng has been broken on AR for awhile, I write about it every once in awhile but only a handful of nauts seem to care. I’ve read reports of the other Elektron machines behaving wonky with chng as well. On AR MKI OS 1.31B chng does not work as stated in the manual, it does work using manual sequential change but that’s it…
Here’s one of the several times I’ve tested, confirmed, and reported: