Ok here is an unofficial build. Remember this is not a finished project, OP is just sharing his progress with us
Extract this archive. There is a file inside this archive that ends in .img, that is the file you flash, not this .img.gz file.
Load the .img into Etcher.
Pop your SD card in and select it in etcher. It will wipe everything and all partitions on your card. Once it flashes, safely eject the "disk", and boot it with Painless Linx (not shofel2). Boot it first, dont stick it back in and try to add roms, it will break it.
Once it boots, it will create the file system and expand the size. After you shut it down, THEN you can add files into the SD card (the large partition only)
Yes, the battery desync is there. No sound doesn't work. Yes, many cores work, even PPSSPP. I recommend charging your battery to 100% in Horizon (the regular Switch OS) , then boot into RCM and linux, leaving the charger plugged in. When done, Shut Down, leave plugged in (make sure it is shut down by hold the power button at least 12 full seconds). 5 minutes later, boot into Horizon. Might not work for everyone, but it's your highest chance of not having to unplug the battery.
Remember, this is an unofficial build, and is
unsupported by me, OP, or anyone.
Removed.
Thanks to
@natinusala for doing this and all his hard work. we appreciate it!