V 9.2.x hangs with "random: crng init done"

The bootloader config is stored in EEPROM on RPi 4B so it's still the same regardless of OS (if the OS does not modify it).

I don't see anything strange, it looks like a default but you may play with some options (especially BOOT_ORDER) to see the difference.

See this page for details: Raspberry Pi 4 bootloader configuration - Raspberry Pi Documentation

Also make sure you are using the proper image file ( LibreELEC-RPi4.arm-9.2.6.img.gz ).

You may also try some multiboot (aka NOOBS) image.

BTW. 2GB USB stick is too small AFAIK... Use at least 4 GB.