I've heard if the usb is shoved in too hard it can push the board around inside. Maybe on removal it dragged yours down? Try inserting the cable and wiggling it out again.
Here's the instructions if yours was missing:
Thank you! I received those instructions too. But they seemed very confusing. I will have to read them again.
I noticed this issue as soon as I opened the package. So, it came defective from the factory. I also noticed that the micro USB port is loose and is moving along with the charging port flap when I open and close it. I can see that the flap is actually pushing the USB port inside when I close it (and this is making the button unclickable). When the charging cover flap is opened, the USB port is moving in the opposite direction & I can click the button again.
I never tried refunds on AliExpress, but I hope I will get a refund with this unit as it is defective out-of-box. I tried to show the defect on a video when I opened a dispute, but I don't know if I could capture it properly.