I've had that happen with more than one Chinese noname GPS.
I currently have one that will start the software and it appears to run, but it keeps dropping the GPS connection no matter what software I try on the internal flash drive.
Reflashing the firmware didn't fix it, any software runs fine from an SD.
I have two other devices that can only be used when Software is on, and run from an SD.
I believe the cause might be faulty internal flash drives, and if so there's probably not much can be done to fix them.
If it were me I'd either try reflashing the firmware, which would probably be hard to find the correct one, or I'd simply keep running the software from the SD and pretend it was running from the internal flash drive
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