DELL Venue 8 Pro Slow Network

during searching for a small issue to network performance with my new DELL Venue Pro 8 I read some articles about this issue and my solution is:

Reset your device complete (Update/recovery)
After init deinstall KB2883200 from Updatelist
Restart
Install all other Updates (new check)  (but not KB2883200)
Restart
Install KB2883200
Restart
Update with the newest Qualcom driver from DELL Support Website.

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