Question about youyeetoo R1 SBC

youyeetoo R1(rk3588s)
1
  1. The root password for the PC.
  2. How to access the UEFI in case need to re-install Debian or Ubuntu: the computer doesn’t boot with a splash screen or offer boot menu options which would allow me to boot from an external installation media.
2

account number：youyeetoo
password：123456

Burn to EMMC | youyeetoo wiki

3

the uboot with UEFI is not tested,

maybe will support later,