Please help tp link TL-WR841N v9

Hy there i just downloaded open wrt 18 somthing sorry i am new to here
It was for a tp link WR841N v9
I downloaded the squash factory bin
I ran the firmare and it said update and restarted
But no matter what i try i cant log into the gui i have downloadd putty
In putty it tells me that he device is full
When i type in commands
I still have internet acsess
Please help