sup people, i ran into a very strange problem with these used S9s 13.5th batch i got, all of them have the same exact problem.
when i try to flash a new firmware , the miner shows "update successful" and then restarts itself "normal" but when i try to login with either root/root from browser ,or root/admin using ssh nothing will work, i have to physically power the miner off and on to be able to login again, and once i do, the same old firmware is there still.
i did a hard reset for all of them and now they seem to have factory default firmware.
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.imgur.com%2FahFdr8r.png&t=665&c=svFu8mDVVLRM2w)
but the same problem is still there.
things i tried
1- resetting using both IP reporter and pin "no different tho, because i know the reset worked"
2- i tried almost every single firmware for S9 from bitmain website
that's all i could attempt before i ran out of time, and had to go take care of something at home, so i left them running on default firmware which works just fine except that temps are higher on this batch than the rest mainly because of the firmware difference.
has anybody had a similar issue? what do you think the possible cause?