well, I barely disassembled RK270X fw, so I definitely won't be able to help you in this.
Though, I am sure that screen driver is easy to modify, but if you want to modify touchscreen driver, you are in big troubles. I couldn't make a driver for my RK260X player using provided SDK in C (and I gave up). But in ASM it is even harder, and in my opinion impossible. I mean, everything is possible, but maybe you don't realize how much more you need to know to do such a small thing like modifying the keyboard driver.
I don't mean to discourage you but, there aren't people enough knowledgeable to tell you what to do without experimenting with the player. It is so much easier if someone has the player in his hands.
To be honest, we are just amateurs trying to squeeze everything we can from the players we've got. That's not even programming forum, but just mpx, though it's a pretty good luck that some of us have experience in programming.
I hope you'll make progress in it.
BTW. What for do you want to get this FW working? How does it expand the functionality of your player?
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