Hello, if your USB flash drive itself has no protection switch, it is probably a USB flash drive problem, such as black disk, fake disk and expansion disk. You should find a mass production tool for this phenomenon, which should be no problem. After mass production, the capacity of U disk shows the real available capacity. Download a ChipGenius from the Internet, plug it into a USB flash drive, open ChipGenius, and the software will automatically detect the main control chip of the USB flash drive. The download connection of mass production tools corresponding to the main control chip is as follows. How to mass-produce, various methods of controlling chips are different, depending on how the chip manufacturers design, but as long as the chips are not too uncommon, you can find many tutorials online, so don't worry too much. The following is a mass production tutorial for your reference: