Thank you to @dingbatca for the instructions on how to get started with these..
I have a twelve site network all connected with EdgeRouters. I got an extra unit and put OpenWRT on it a few days ago.
Took a while but I got vlans working, cake, option252 in dnsmasq, and a few other things; Cake and the newer 4.x kernel series was what got me interested in removing the Ubiquiti firmware; Wonderful..
Along the way I would run into this problem where I couldn't login anymore, I would have to reset the unit, would lose all my work and have to start over.. (very not exciting)
Always running the 18.06.1 build from August; (thinking that's the problem)
I've been running the unit for a few days now, with no changes to speak of with no password.. I just took a backup and set a password.. now I can't login again..
openwrt-18.06.1-ramips-mt7621-ubnt-erx-squashfs-sysupgrade.tar listed on the device page is what I used..
Is there something that I can do to get back into failsafe mode on this unit?
I did the tcpdump -Ani command and can see the message: press button now to enter failsafe mode
When I press the reset, I can no longer ping the unit (192.168.1.1 from eth1), I've tried other ports, etc..
I can't effectively deploy these if I can't ever recover them..
Looking for suggestions..
Thanks in advance.