Hi there,
Long term linux user here, also decades+ of open elec, then libre elec usage.
first time core elec user as I was mostly running x86 hardware.
Got my hands on hk1 rbox x4 device. 4g ram, 1g eth
booted core elec 21.2 stable from sd and then installed it straight to internal flash, wiping the android clean 
question 0:
Am I fine running stable CoreELEC-Amlogic-ne.aarch64-21.2-Omega-Generic or should I move straight away to nightly? I saw wiki mentions of “run latest nightly” but not sure if this is some obsolete info from years ago when this box first appeared or is it still relevant?
question 1 - do I still need to create this autostart.sh to modify dtb today, or is it some obsolete info? can someone explain what is it for?
And in case I have already done it, was there any harm done and how to undo the changes to the dtb.img?
coreelec:vfd_hk1_rbox_x4 [CoreELEC Wiki]
thanks and kudos CE team, great system!
edit: for any users of the same box
remotes/MesonIR/HK1 X3/hk1x3 at master · CoreELEC/remotes · GitHub
config files for remote
look for this on wiki: coreelec:genvfd (not allowed to put more links as a new user)
config files for lcd screen (mentions here use nightly, but works with stable as well)