EM770U lost GPS function

[AndreyPopov]

for my TablePC I buy Huawei EM770U with GPS.

when I change preinstalled EM770 for EM770U Windows find:
Huawei Mobile Connect - 3G Modem #2
Huawei Mobile Connect - 3G UI Interface
Huawei Mobile Connect - 3G Application Interface
Huawei Mobile Connect - 3G GPS Interface
Huawei Mobile Connect - 3G Control Interface

but.......
I'm not sure after that but become again:

Huawei Mobile Connect - 3G Modem #2
Huawei Mobile Connect - 3G UI Interface
Huawei Mobile Connect - 3G Application Interface


GPS DISAPPEAR!!!!

1. I install internal dashboard by UTPS23.001.03.15.999_NiRaV_SoN!.exe
2. try unlock CD by Huawei Modem Unlocker v.5.8.1

my EM770U become like EM770.

please help undestand what's happen and how revert my EM770U GPS function?

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solution found: in terminal AT command: AT^U2DIAG=512