yesterday I wanted to install the latest updates to my OpenWrt router (a Fritzbox 4040). During the updates process the FB was dying. No way to get it back to life.
Today I tried the updates on another hardware, a FB 7412 - same issue. Machine dead.
Last status on the console was:
The TOH page for FB 4040 links to guides for debricking and factory reset. Did you try these?
only flash a release candidate OpenWrt version to routers to help stabilizing this future release and if you are ready to run into problems on these devices where you run that release candidate. Release candidates are built for testing, not for production.
So if you want to install a 21.02 snapshot build, you should be wiping your settings (basically /etc/config/network needs to be rewritten, which will happen if you wipe settings during sysupgrade). The migration path is broken ATM, and that's holding back the RC2 as you can read in the mailing list message.
@Rocky I edited your generic topic title to reflect what's actually happening.