Hello
I bought a used Antminer S3 but the user and password "root" doesn't work. The previous owner must of changed it.
Anyway to reset it?
Check Dogie's guide at
https://bitcointalk.org/index.php?topic=702653. There is a reset switch accessible from the front panel, next to the 2 LEDs and Ethernet connector. You power it up, press the reset button through the hole using a paper clip or similar thin object, hold it for 5-10 secs. This will reset it to factory defaults, including the password.
Cheers
Are the lights suppose to change when pressing the button? They all stay lite, like pressing it does nothing.
Yes they are, suggests the unit is on a firmware where the reset button's functionality is broken. While you wait for your seller to reply to your password email, you can SSH and control them from there. This will at least get you up and running.
1) SSH to S5, Login root/root
2) Type "screen -r". Wait for all the messages to go through.
3) Type "P" to enter Pool Management.
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.