Maskrom pin for mini5_V2

[helg]

My mini5_V2 is stuck at in the UVC USB mode after switching from the usual USB storage mode.
The best way to reflash eMMC on Rockchip CPUs is to ground the Maskrom pin, stopping the boot process
before loading u-boot, Linux kernel et al. There are several test points on the motherboard, but which one is for the SARADC or eMMC CLK??
There should be a proper way to recover the corrupt eMMC on such dashcams missing the SD card.

 

[helg]

I have found this pin close to the SOC labeled "AA" and could switch into Maskrom USB mode, but it rejects all upgrade_tool commands
(even erase flash) for some unknown reason and after some period of inactivity starts the usual eMMC boot. Combined with the very hidden pin location, which requires full dismantling of the dashcam, mini_V2 deserves the title of the most repair-unfriendly DDPAI dashcam ;-)