There are various formats of cards and FAT32 is better for recording in a dashcam
You may format the cards by the cam itself or by the Format tool.
Usually, if the cam keeps giving you a "Please format the card "error, we suggest formatting the Micro SD card by PC.
and we also suggest trying a new card,
Please download the GUIFormat tool from the attachment. after downloading it, it will recognize the SD card if you plug a card reader with the card into the computer, then you can directly click the "start". if you want to deeply format the SD card, please don't sele the quick format.
Below are the cards we recommend, you shall try one.