Hi, here is the Dome GS90C Car DVR firmware.
Please click this link to download: Dome GS90C Car DVR Firmware
1. Prepare a SD card, and format it.
2. Copy the firmware into the SD card.
3. Insert the card into the car DVR and power on.
4. It will auto-flash.
Note: After you finish the flash, please delete the firmware in the SD card, or it will auto-flash again.
Have a nice day!