hey, I got TWRP 3.1.1 working on my t9 rk3328 with rock64 androind 9.0 (PIE) firmware. the ramdisk and display is not working properly but it gets the job done. I used few xda android kitchen and rockchip's SecureBootTool_v1.94 , rk_sign_tool_v1.3 to sign the whole firmware. and it got it working. I installed the pacman gapps. with rock64 sotck firmware it runs smooth. I used rk3318 boot file because rock64 was not booting.
Just wanted to let yall know TWRP boots and you can make thing happen if you search for android kitchen scripts and few rock chip tools from github. It too me 2 days of trying different things.
Also magick does not work.
Put in the loader mode (with adb reboot loader or by pushing the pins) -> use rk tools to loaded img (i packed it with rock64 firmware and signed it)--> tv box starts ---> reboot to loader ---> just flash recovery section --> start---> reboot to recovery (adb reboot recovery) and flash pa gapps.
If it does goes smooth I will compile the rktool flash firmware later.
Here is the stuff I put together. I did not coded the ramdisk and stuff.
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