updating the firmware - Esato archive

Posted by TomMy_lee
Hi! Me again. I wish to update my firmware as my D750 which was flashed to W800 R1AA008 when I bought it to a newer firmware as this one is very old. Can anyone tell me can I just update it but not flash it? Tried with SEUS but it didn't work coz the IMEI is D750 but GDFS is W800. So....anyone knows?
Thx