EDIT: SOLVED.
Started working fine after nearly an hour of looping (apparently five loops was the trick). I assume it was so old that it needed multiple updates to continue, but this could have been communicated. And it could have been communicated without trying to get Sidewalk enabled every time.
So, anybody activating an older unit... patience, I guess?
ORIGINAL MESSAGE.
Bought several Echo Show 5" devices years ago. Kept one, others meant as Christmas gifts, but had one left in storage. Just tried to set it up for the first time (pic of serial number attached).
It's now in a loop: I get asked to Enable Amazon Sidewalk, I refuse, I get asked if I'm really, really (REALLY!) sure if I don't want to enable Amazon Sidewalk, I refuse, then it spins on "Loading" for about 10 minutes, then begins the loop again. Been four times so far.
I will not enable Amazon Sidewalk.
Any ideas to get some forward movement? Thanks in advance.