Tried to flash it with common Rockchip Box technique with no luck (tried some roms from Armbian, firefly, and some OpenWRT method ... refer Fig. 1.5, 1.6).
Anyone who can give some pointer will be much appreciate.
Known techniques:
- enter recovery mode = plug in the HDMI, use screw driver to poke the inner "hidden button" in audio jack, and plug power - working
- another way of getting into the recovery mode = using the command "adb reboot recovery" from either network or USB type C - not able to flash
- enter bootloader mode = using the command "adb reboot bootloader" from either network or USB type C - don't know how this work
- enter mask rom mode = plugin the HDMI, use screw driver to poke the inner "hidden button" in audio jack, and plug USB mal-to-male cable to PC - not working
- another way, is only accesible via old fashion tty usb through the TX, RX, GND pins (top right of Fig 1.3.), need to open up the box and do some soldering, to directly read and command from the system.
References:
- Figure 1.1.
- Figure 1.2.
- Figure 1.3.
- Figure 1.4.
- Figure 1.5. official rockchip Wiki: https://opensource.rock-chips.com/wiki_Boot_option
- Figure 1.6. OpenWrt Wiki: https://wiki.friendlyelec.com/wiki/index.php/NanoPi_R6S