ahh I'm bricked! I recently bought a RCA DB2, was on RCA firmware (Jan 30, 2019) Build 190124 and it worked great. Then, using batch config, tried upgrading to Nelly's (Nov. 22, 2019) Build 190625 (ONVIF Support). Batch config showed it 100% completed, only to find that the bell is now at the red ring of death. Tried powering off the circuit for 2+ hours, held reset for over 60s, still solid red ring. I also tried putting the original RCA firmware in the root of the SD card and reboot (breaker off and on), still straight to solid red ring. Unfortunately, I tried the firmware upgrade before the new message of "don't upgrade RCA" was put up, haha. If there is any other info I can provide to help anyone come up with any ideas for me to try to fix it, please let me know!
edit: just realized when I turn off the breaker, the bell is still powered (should have known, seeing as how folks said to power it down for ~1hr due to internal battery), so putting the firmware on the SD card attempt wasn't a real attempt. Currently waiting for it to power off and will try the SD method again (not getting my hopes up though :-\ )
edit 2: sd method didn't work (made sure to rename to digicap.dav). Does the SD card need to be empty other than the firmware file? (I kept all the .bin and recordings on it)