9.7 LCD Monitor Firmware Update and Flashing tools
Disclaimer: Laser Bear Industries is not responsible for damages caused by the use of this tool or firmware. Flash this at your own risk.
You will need a flashing device called an RTDTool Sometimes called a Realtek ISP tool. Sourcing this device is a bit grey market, so it may or may not be found on sites like Amazon, eBay, Aliexpress, Bangood and so on. They may be difficult to source or not stocked everywhere.
It will look like this:
Here are some links that I have been able to find to the tool:
On aliexpress search RTD2556 dedicated programming tool RTD
There are programmers that claim to support the RTD ISP, but I have not tested them, if you are willing to try and ok with the possibility it will not work here is a MStar programmer
Another thing that may work is the open source flashing tools for the RTD2660
that chip is similar so the ISP for it may work with some extra effort, again this is not tested, but if someone is willing to tinker and see if they can make it work it may be worth a shot to get away from the proprietary tools that will disappear as Realtek finds them.