Reading between the lines of your post, I'd say you have been to this thread & made a mess of your GPS.
Since you can go back to original Launcher & problem is solved, you must have a back up of your Device software/firmware, well done, a lot of people fail to keep a back up of original.
Actually just found a post by you in that thread.
So you have got a working GPS & you want to modify it. Can only suggest you read the the rest of that thread to see where you went wrong.
Good luck.
Looks like a lot of you having similar problems with Chinese GPS
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