That worked!  Thank you.  I had thrown mine out in my electronics recycle box, and they have not came to pick it up yet.  So I took one out, did this firmware roll back, and I am in.  Wow is all I can say.  Thank you.

Unfortunately I do not think there is anything anyone can do, not even Cisco, unless they have some super secret back door into them.  If you reset the device (like I did) and you still cannot login (I couldn't either), then I really don't see a way ...

Good luck.  I have had zero success logging into them after a reset.  I had 7 of these in production.  5 out of my 7 exhibited this behavior, 2 are still ok.  When I bought all of these, I bought one more to be used as a hot spare in the event one ev...

I have the exact same problem.  I have 7 of them in use.  I was able to login to all 7 of them back in April and May of this year (2022) to apply my Cisco licensing.  Now I need to make a small change and update firmware.  I was able to login to 2 ou...