G-Tab 709M “” T786-mainbord -v2.0 “” Probleme LCD affter flash !!

Ho to slove This Probleme :
I Have Gtab 709m Tablette with Password But Affter Flash i have Lcd Probleme.
i have tryed all This firmware But Always Lcd Probleme
T786-MAINBOARD-V2.0-by kamran yazdani
T786-MAINBOARD-V3.0 2014.08.04

i find a NOTHER FIRWARE for my tablette but in Zip Format
My Tablette Can’t Go To Recovry Mode How can Flash it with Zip FIrmware ?