It continually rebooted yesterday. But this morning, for some unknown reason, the rebooting stopped. However, the error message "Operation Failed" still appears when I try to load the App Manager, and the repositories are all gone when I do App Manager > Tools > Catalogs.

Also, before I read your reply, I was about to reflash. However, the Nokia IT Software gave the error message "Device not found," after each of 2 attempts, despite the fact that I correctly did the swap key + power on and the bluetooth icon properly appeared.

And while I was typing this response, the rebooting loop began again!!!!

I'm kind of lost.