Problem: Some of Huawei and ZTE modems are not compatible with WM8650 tablets.
Solutions: The solution is very simple, but clear: You must disable the flash drive dongle part.
This is most easily done by AT commands:
For Huawei modems:
Disable: at^u2diag=256 or at^u2diag=0
For ZTE modems:
The easiest way to AT commands on a PC you can issue the modem, you can use HyperTerminal or similar terminal program.
Thanks for the idea of the XDA community.
SSD thread if needed (highly recommended: D), disable the Prefetch and Superfetch:
Use the good old regedit:
HKEY_LOCAL_MACHINE ⇒ SYSTEM ⇒ CurrentControlSet ⇒ Control ⇒ Session Manager ⇒ Memory Management ⇒ PrefetchParameters
EnableSuperfetch = 0
EnablePrefetcher = 0