Rock Pi 4 op1, not booting from on board EMMC

Dear,
I followed the instructions (https://wiki.radxa.com/Rockpi4/dev/usb-install) and done the steps pretty well to write a GPT image to on board eMMC, however, it does not boot from the image I burned and tested with debian/ubuntu/android.
Any idea?

Thanks
William

the terminal output to justify the burning:
root@ww-riocento:/home/william/Downloads# rkdeveloptool db rk3399_loader_v1.20.119.bin
Downloading bootloader succeeded.
root@ww-riocento:/home/william/Downloads# rkdeveloptool wl 0 rockpi-4b-ubuntu-focal-server-arm64-20220401-0346-gpt.img.xz
Write LBA from file (100%)
root@ww-riocento:/home/william/Downloads# rkdeveloptool rd
Reset Device OK.

the problem was the .xz img…
unxz *.xz and download the img file works well.