help z3x support.card firmware update stock at 85%

I bought a z3x box from reseller GSMSHARK and cannot instal it for the past two weeks now
It gives a message that CARD NOT CONNECTED then automatically start DEAD CARD REPAIR
The card firmware update times out at 85%
My reseller has remotely troubleshoot and tried to install the box but said it might be due to my network
My network has strong signals and i have used four other networks but the firmware stock at 85% and then times out
I have also turned off Firewalls and do not have any active antivirus but still ot able to update firmware from 0.0 t0 2.2

Kindly help me