Have an 8.5 Th/s R4. When I try to change the pool URL from the default antminer pools and hit Save&Apply all fields go blank and doesn't connect to anything.

Can do the R4 reset button and antminer pool settings come back and mines fine to antpools and resets to root/root. So thought I could use PuTTY to go in and modify the /config/bmminer.conf file to replace the antpool data with my pool and reboot. But when I try to log in with the default root/root I'm told invalid password even though it lets me log into miner from browser using root/root. But even in browser when I try to change password using "root" as current PW, it tells me invalid password???

Bottom line is I can turn on and connects and mines fine to antpool but I can't change the pool settings.

Anybody see before and know how to fix?