i know we got some here with older iphones, specifically 6s? if yes, have you upgraded from 14.8.1 to 15.5? not sure if i should go ahead 
Still running iOS 12.2 here. Apple keeps bugging me to upgrade though. Well you can always restore from a cloud backup if it doesn't work out. You do cloud backups don't you?
from what i read you can't roll back the ios. so if 15.5 won't work (and the phone no longer works) having the cloud backup won't help much
Oh weird! I read the backup will restore the OS that was saved on your backup (it has to be from the phone that had the backup, or it won't restore the OS). So I did one backup with 12.2 and I then turned off backups. Thus if I accidentally touch the wrong thing on the screen when Apple pops up out of the blue to upgrade and it does, I can go back through a restore.
well ...................
for the 6s the only version available is 15.5
''Signed IPSW files can be restored via iTunes. Unsigned IPSWs cannot currently be restored via iTunes.''
Sounded like two low altitude missiles just flew over the house. Just checked Flightradar24 and there is nothing flying around around here for 100 miles. This could be bad!
I feel kind of awkward having just dropped in from no where with a smart alec line, so how's this. Afternoon coffee anyone?
Ever update a program under Linux? It isn't fun. And heaven forbid if a program requires a kernel update to run. Ever update Linux itself? It is easier to just wipe the disk clean and start from scratch. And oops... no Linux driver for your touch screen? Too bad! Deal with it.
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