Kinhank G1

Hello, I’ve just received a Kinhank G1 SN starts with 255. I know it is not officially supported, but there are DTBs, and if I succeed opening the bootloader it should be fine.
I’ve already looked at the topic: Kinhank G1 (Start Guide)
Is the ROM currently flashed (including dovi.ko) interesting in any way?
Which Coreelec is recommended for Dolby Vision support and stable use? NG or NE or NO?