For anyone searching, found this on Bitcointalk.org. Here is the short answer:
You have to telnet into the machine:
telnet 192.168.1.254 8100
Then use:
username: root
password: t1t2t3a5
For firmware built before 2017-12-22, the password is 12345678
apparently, haven’t tested.
Logs are found in:
/tmp/log/innominer.log
/tmp/log/analys3.log
/tmp/log/analys0.log
/tmp/log/analys2.log
/tmp/log/analys1.log
/innocfg/log/miner.log
/innocfg/log/upgrade.log