Hi, I've just upgraded a router to v1.28.8754 ND USB Ext (K24) and SSH public keys for remote administration stopped working. It seems like they are ignored, and I don't see any log message anywhere. I had to activate password login to be able to remotely access the router (and password login works).
I tried reconfiguring them from scratch, copy & pasting them from the .pub file into the web interface, but no luck. I see that the keys are stored in NVRAM (sshd_authkeys) but I don't know how they are used by dropbear; is dropbear directly reading them from NVRAM? How can I further debug this issue?