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...]
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.
The 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
- ROM in .IMG format - an 'OTA' is not a full image file and will not work
- Rockchip SDCard create tool (here...placeholder)
1. Create SDCard using Rockchip SDcard create tool.
2. Insert and boot from SDcard, follow prompts.
B. OTG method - (may require Jig, or if lucky an USB A-A cable.) The below method wil recover a 'bricked' or non-booting unit.
The following is required:
- ROM in .img format, or partiton extract
- Android Tool and Driver:
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://forum.xda-developers.com/and...h-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.
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.