Ender 3-PRO , Creality 3D v1.1.4

[una2012]

[Hello,

I need help with my Ender 3 RRO printer which has a CReality 3D V 1.1.4 board and the factory installed CReality3D 1.1.6.2 firmware.

Is it possible to install a newer Marlin 2.0 or 2.1 on this 8bit board?

I don't know what all has been changed on the printer, but I see that some Direct Drive has been installed, me, a touch sensor or a filament sensor.
I would use it for my own needs, so I thought I would improve it a little. I prepared Octoprint, but I would like a newer FW if possible.
If anyone can help me, how do I update the FW?

Thanks in advance and greetings from Serbia