Step 1: Please make sure that the card-reading function is opened; Step 2: Check whether the frequency of the card matches well with the  protocol; ( Currently, it only supports high-frequency card including  MF0，MF1，15693，CPU).

Metal and liquid (water) material have a strong interference to the UHF  signals ( the closer to the tag antenna, the stronger interference of the  signal); It is able to adopt anti-metal tag in the metal environment,  however, it still remains hard to solve problems in liquid environment. 

If it fails to scan suddenly in use, the same setting of the scanning head  and the barcode to be scanned may possibly result in it. If you change  the setting of the scanning head unintentionally, you are supposed to scan  other types of barcodes and send the result feedback to Cilico. 

Step 1: Please make sure that the left and right scanning options are  opened; 

Step 2: Close the scanning type APP; 

Step 3: Try to scan with system scanning option; if it works, then the  device is working properly.

Step 1: Disconnect USB; 

Step 2: Take out the battery and install the battery agian; 

Step 3: Repeat reflash process.

Step 1: Change the battery or charge with the USB cable and try to start  up; 

Step2: If it still fails to charge to start up after changing the battery,  it is possible that the battery is over discharged. Please keep the  charging connection with USB cable, then take out the battery and instsall  again, activating the battery by repeating 3-4 times. Try to start up after  charging for 30 minutes.