Service [Q] firmware version encountered an issue for s duos- INDIA

Hey guys m in deep trouble so my frnd recomended me dis place..
my father has a samsung galaxy s duos ( GT-S7562) it is around 1.5 yrs old and as usual is working vry slow.. so i said him dat i'l root his phone.
while rooting i did forgot to enable USB debugging.. nd the phone is now displaying the following error - " firmware upgrade encountered an issue .... "
i need ur help pls pls help me out of this prblm nd tel me a pproper procedure to get things right agn as he ( my father) has a lot oof office work in his phone which i unfortunately dumped..

Help me out guys..
m from INDIA, Asia .. also tell me frm where wud i b able to buy proper firmware version.. nd please do not give me solution related to KIES as it sucks i hav already tried it..
Thanku in Advance..
the 1 tells me the procedure wil get good wishes frm me ..
help me out guys