1. Check if the SD card is faulty

2. Check if the slot is loose

3. Alcohol cleaning

First of all, check if there is a problem with the SD card. First, check whether the card can be used normally on the computer. If the SD card can be used normally on the computer, then you can save the file to the computer. After formatting the card, try inserting it into the machine. Note that the side with the chip is upward, and there will be a click sound when inserting it, In the power on state, if you plug it in, refresh the SD card and select the last refresh on the interface.

Card slot problem, long time use card slot appeared card holder shaking, poor card reading, in this case, to replace a new card holder to solve.

The card slot is oxidized. If the first two are OK, you can try to apply a little alcohol on the SD card, and then insert the card into the card slot for several times to clean the card holder to see if it can work after cleaning.

Poor contact, sometimes the card can be inserted for a moment to read the card, and then suddenly no reaction, at this time you can quickly plug several times, and then try to plug in after the power off, and then clean the card with a little alcohol to see the results.