Does anyone out there know how to reset the trans computer from Back-up mode to the normal operation?

 

I presume waht yuor talking about is that all of the gear selection display is eluminated, if so this means that there is a fault in the system and you need to interigate the fault memory of the gearbox ECU. From here you will be able to decide what part of the system to start looking at, if you have already replaed the faulty part then you just need to clear the fault memory, this is done by;

gearbox 02
interiagte fault memory 02
erase fault memory 05
exit gearbox ECU 06

But seeing as you don't know this then I think you'll proberly need to put it into a dealer to have it diagnosed.