i srongly not recommend you guys to flash,u should know that once you flash to other fw,ur warranty will be void....
the following step are just for reference,u should compare n study other method n guide,like
http://forums.windowscentral.com/no...after-reset-flash-process-defined-inside.html
you should know what you're doing....
my step are
1.install the Nokia_Care_Suite_5.0_2012.45.4.5
2.extract the whole fw contain under navifirm/fw/ur fw/ to C:\ProgramData\Nokia\Packages\Products\rm-846
3.open product support tool inside nokia suite
4.under file option,select offline
4.click file,then open product n select rm-846(dont connect ur phone yet)
5.click programming then recovery,u should see ur fw after u click the ''update list''
6.select the fw u wish to flash then click start
7.the program will verify ur firmware and ask u to connect to phone
8.now connect ur phone,restart it,and when u feel the vibration,click retry button
9. if u flash the original product code,it will start straight away,if u flash fw other than that,it will ask u to select product code(can ignore it,just yes)
10. once the phone done flashing,it will restart itself...