The specific features of the firmware depend on the version number, but recent updates for the Z40 series have focused on:
The dashcam will power on automatically. The indicator lights will begin flashing rapidly, indicating that the firmware installation is in progress. Ddpai Z40 Firmware Download
Format the card to (for cards 32GB or smaller) or exFAT (for cards 64GB and larger). The specific features of the firmware depend on
This is a last‑resort recovery procedure. It is dangerous if the power supply is unstable, as it could permanently corrupt the device’s memory. Only attempt this if your camera is already unusable and you have contacted Ddpai support without success. Ddpai Z40 Firmware Download