My 600Mhz, 4.05Th Antminr (batch 6) has suddenly just stopped mining, i can connect to it, it shows on pool, allascics are fine, fans running, temps ok but no Gh ???

Firstly they did not even show on minee status page, nothing i then noticed this on Overview page that the -Hardware Version - 0.0.0.0
Overview before flash -

Overview after correct Flash -

Miner status after flash, they were NOT even showing at all before i flashed FW.

Anyone come across this who know anyone who does repairs ?
Cheers