I used the "Faster GPS" app to configure the special fix GPS data . Now for me it's better than before.Or use gravity box to add "boot into recovery" in reboot menu.
Anyway... Do you have any new hints if something can be done for GPS?
I get pretty good signal in GPS test but on maps the reported location is simply wrong (and moving around).
It's only correct for a few seconds if I got a good fix in MTK engineering mode before.
At the moment I'm thinking about buying a different phone with my 55 dollar voucher from gearbest.