Hello umair.zego
You need to convert (IS12S to LT26W)
how to convert
you need these
first to use flashtool-0.9.10.1-windows
IS12S_6.1.D.1.91_kddi.ftf (original software android 4.0.4)
LT26w_1265-3909_6.1.A.2.55_GENERIC-user_CUST_1266-3278_R4G.ftf (original software android 4.0.4)
How to program using the flash lt26w IS12S
if you are to make a return , do not mark
good luck
best regard
proton