You can use et or infinity box or com 1 cable when you use infinity or et you may convert port to com1 see in 1st pic
then press *+5+power on/off switch and open ccs flasher you are phone is open see 2nd pic
then click on tab bundle flashing see 3rd image
then open Flash file C:/program files/nokia/product/rh79
then click update remember continue press 3 emergency mode keys till flashing complete
Flashing Prosses :-
To flash dead hand set or hang on startup mean only show battrey point when we start the handset to need flash in emergency mode & going to emargency mode you need press *+5+Power on/off continue till flashing not completed when you press both r three key your phone cant be start but you can see your phone position as 2nd pic
remember you will lost your all data mean min no.
Cable Pinout
1st = rx
2nd = tx
For ground you need sold 7+8 to battry connector
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