Originally Posted by math64
Did you install new firmware to your M92? After repair, it may have old or service firmware in it.
Also, you can format internal memory.
Memory is not storage. If you have a memory problem, the device won't run at all.
Also, read his post: he states that he formatted the internal flash storage.
Are you able to attach your device to your computer? Does it get detected? Can you transfer files to your device and are they displayed on the device?