I've had the N4 unit in my truck for about 14 months with a Vantrue branded SD card. For the first 12 months, everything worked as well as I expected. Then the device prompted me to format the SD card. Before, I only formatted when the card filled up. I've tried various time loop settings, but it still prompts weekly to reformat the card. Any suggestions other than buy a new card? Thanks.
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Please update the firmware to latest to have a try. If the issue persists, please use another SD card to have a try(if you have another one already). Please contact us at support@vantrue.net if you need further assistance from us. Thank you.