Installation
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Flashing the bootloader
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for the firmware you need the program android-tools (prt-get -if -is depinst android-tools)
bootloader to be boot-xxxxxxxx.tar.xz (https://dl.irradium.org/irradium/images/lichee_pi_4a/)

  # sudo fastboot flash ram boot-xxxxxxxx/u-boot-with-spl.bin
  # sudo fastboot reboot
  # sleep 10
  # sudo fastboot flash uboot boot-xxxxxxxx/u-boot-with-spl.bin


Flashing the SDcard
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Unpack the IMAGE file and copy the image an SD card: (assuming SD card at /dev/mmcblk0):

  # zstd -d irradium-*-core-*-build-*.img.zst
  # dd if=irradium-*-core-*-build-*.img of=/dev/mmcblk0 bs=1M

or unpack directly to the card

  # zstdcat irradium-*-core-*-build-*.img.zst > /dev/mmcblk0


Instalation eMMC/NAND/USB-HDD
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to transfer a system with the SD to eMMC, you need to boot from the start and run the script:
  # transfer-to-disk


Default Login
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login: root


Debug
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    Pin 4   is GRD
    Pin 9   is TXD (U0-TX)
    Pin 10  is RXD (U0-RX)

example: screen /dev/ttyUSB0 115200