Decided to try out the new 1312-B10D FW, V.5.13(AAXA.8)C0 on my spare unit, not line commected.
Yes, completely different GUI appearance which I took an instant dislike to, all the same features are still there, just different access navigation, certainly not an improvement in my opinion.
Before hurriedly "trying" to get back to FW rev. V.5.13(AAXA.5) made the following observations:
Telnet/Busybox access is available.
None of my PW's had changed, still had full supervisor access.
The "passwd" file appears to no longer contain the crypted PW character strings, "cat /var/passwd" produces this:-
BusyBox v1.20.1 (2018-08-24 13:58:33 CST) built-in shell (ash)
Enter 'help' for a list of built-in commands.
$ cat /var/passwd
nobody:x:99:99:nobody:/nonexistent:/bin/false
root:x:0:0:root:/home/root:/bin/sh
supervisor:x:12:12:supervisor:/home/supervisor:/bin/sh
admin:x:21:21:admin:/home/admin:/usr/bin/zysh
Tried to roll back FW to revision V.5.13(AAXA.5)
Warning appeared advising that some "feature may be different", OK to continue or Cancel to go back, only problem being there were no OK or Cancel links/buttons in the window, enter or escape wouldn't work either !
On aborting and re-trying the same revision, this time advised that the (same) file was now an "illegal image, failed".
Decided to try rolling back to the previous FW revision, V.5.13(AAXA.7)
Did not display any errors as such but just sat with the busy icon continually spinning, gave up after considerable waiting time and closed the window.
Much to my surprise when re-connecting, had gone back to V.5.13(AAXA.7)
Checked Telnet/Busybox access on this revision and found that this now worked, no Busybox access had been a known issue with this revision, the "passwd" file content still looked the same as V.5.13(AAXA.8)C0.
Now was able to roll back to revision V.5.13(AAXA.5) without any issues.
The new 1312-B10D GUI interface is not for me, I much prefer the existing ZyXEL GUI appearance and functionality.
There certainly appears to be some bugs associated with V.5.13(AAXA.8)C0 FW upgrading/rolling back operations.
Location of encrypted PW's appears to have changed, perhaps the PW encryption policy/method has changed ?
Edit: Typo corrected.