[MTCD Software Development] marchnz:
To upgrade a MTCD/E PX3, PX5, PX6 from Android 6+ on using official Rockchip free tools - a reminder, bringing together multiple threads.

First note - if coming from Android 6 - early versions of Realtek dual BT/WIFI (type 2) are not supported past Android 6.

[29/06/2020 - Android 10 - Users are report Bluetooth MD725 Type 1 is not working on Android 10...]

The only fix is to replace the wifi/bt module with the supported "type 1" GOC-MD-725. See this thread for details (placeholder)

Risk:

Also, there is risk associated in upgrading. The SDCard method is known to result in back-screen, sometimes recoverable booting to recovery from SDcard again. If this method fails, OTG becomes the only recovery option.

Two Rockchip Official methods;

A. SDcard Method

Note: To use these methods, your unit must support booting from SDCard or USB. Not all MTC variants are created the same, so test first.

The following is required for SDcard method

- (1) Full ROM in .IMG format

OR

- (1b) bootloader/recovery only image to flash recovery,

https://drive.google.com/folderview?id=11zpgoOW4eU6G1tjs7ExsZ2aC4RoZ9KDr

AND

- a 'full' OTA of your choice.

- Rockchip SDCard create tool

https://github.com/rockchip-linux/tools

1. Create SDCard using Rockchip SDcard create tool.

2. Insert and boot from SDcard, follow prompts.

3. Wait for install to complete...and can take some time

(1b) Flash boot/recovery image then an OTA zip. Thanks to @ikerg for recovery .IMG files.

2b. Create SDCard using Rockchip SDcard create tool with .img

3b. Insert and boot from SDcard, follow prompts.

4b. After flashing, remove SDCard, boot to recovery then flash an OTA from another SDCard or USB stick.

* Download bootloader/recovery flash image from here; https://drive.google.com/folderview?id=11zpgoOW4eU6G1tjs7ExsZ2aC4RoZ9KDr

B. OTG method - "Never fail, flash like a Boss, impress your friends method"

*May require Jig, or if lucky an USB A-A cable.)

The below method will recover a 'bricked' or non-booting unit.

If wanting to backup your ROM and test other ROMs, this is the method you want.

The following is required:

- ROM in .img format, or partiton extract

- Android Tool and Driver:

https://github.com/rockchip-linux/tools

1. Install Rockchip driver and Android Tool on PC/Laptop.

2. First try connecting your unit USB to USB using cable to PC. Try all headunit USB ports.

3. Try entering recovery. If successful you will hear the new device chime on your PC and the headunit will be connected.

If connecting via USB method does not work, a jig must be made. See the following thread for details: https://xdaforums.com/android-auto/...px3-5-headunit-mod-recover-flash-som-t3766892

4. Using Android Tool connected via USB - Flash SOM using .img file. If image file does not install, erase flash first after selecting .img file.

C. Downgrading steps here:

https://xdaforums.com/t/mtcd-e-android-10-upgrade-using-official-free-tools.4123933/post-85473141

Hope this thread clarifies the two free and official methods to upgrade your headunit. Enjoy.

29/06/2020 - Update - Users reporting MD725 - Type 1 Bluetooth is not working on Android 10.

28/07/2020 - Update - include bootloader/recovery plus OTA method from IMG files kindly created by the talented @ikerg .

29/06/2020 - Update - Users reporting MD725 - Type 1 Bluetooth is not working on Android 10.

March 2021 - Update - BT module found - HW upgrade to enable Android 10 upgrades. See my module thread.

August 2021 - SD Card Downgrade steps - from A10, A9 using A8 for success.

Note: Best, most successful risk free method - OTG