Hi,
do you see the system disk i.e. a usb-drive which is about 90megs in size and has folders like "SYSTEM"?
If so you can copy new firmware files to that partition where by firmware files I mean those "SYSTEM" folders and files not a single file.
If you dont see it I can provide you with information how to make it visible and hwo to extract those firmware files and folders from a firmware update file (those that the Rockchip device manager expects), that would require some programming knowledge though (you mentioned you started to write your own driver).
Regards
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