How do you expect to ssh in with root/root if the password was changed? If root doesn't work for the webui pass it won't work for ssh either(barring some very unusual configuration). You should upgrade the firmware as soon as you are able to login as you are most likely on the very dangerous oct 24th firmware. If you can't get the password from the seller you will have to use a TTL cable to reset/reflash it manually.
Because SSH and webui logins are entirely separate, changing the webui password has no impact on the SSH password. The entire point is that he can't log into the webui and so must use SSH access, else he will likely have to send the controller in.
The Oct 24 firmware is also NOT dangerous, its stable as hell and would be great if it didn't have broken reset button functionality.
Yes the seller finally got back to my with the password and I am greatful because the webui and ssh BOTH didn't work without the password. The units would of been garbage.
And yes I am on Oct 24th firmware. Any benefits to upgrading in terms of power consumption, or hash speed?