You need to update the firmware to reset the password to the default number 12345678.
Below is the support page for all models.
https://support.viofo.com/support/solutions/19000101567
Note: for A139 & T130, you only need to reset the cam to get the password to default.
A quick step to reset A139: Long press both the yellow triangle button and the WIFI button until you hear a beep and 4 LEDs flash and the camera restarts.
A quick step to reset T130: Long press both the MIC button and the WIFI button until you hear a beep and 4 LEDs flash and the camera restarts.