Hi,
If anybody is bored with SD card partitioning, manual flashing boot loader on rpi3/4, h6/h616, rk3399/3566/3568, s905/s912/sm1/g12 SBC/TVboxes - maybe https://github.com/warpme/miniarch can be helpful?
what is is: https://github.com/warpme/miniarch#what-it-is
this is early alpha - so bugs/issues are highly probable
to quick start - pls look https://github.com/warpme/miniarch#quick-start
in case any issues - pls use GitHub issue reporting: https://github.com/warpme/miniarch/issues
happy burning!