To be more clear at this step my box is flash with you bootloader from https://github.com/ilmich/rkflashtool .
With multitool.img modified with u-boot extracted from LibreELEC11 ( replace the 4 MB u-boot in hex editor), I activated the "Install Jump Start for Armbian" after the NAND was cleaned ( Android deleted). This is the only possibility to boot armbian without modifying the image. I had a lot of problems booting armbian before I flashed you bootloader. Only a modified "libreelec boot and armbian rootfs combination" booted on the box before the bootloader upgrade. P.S. Wifi ssv6051 is not working in armbian and I disabled the driver to avoid a lot of errors on boot.
If I try to boot LibreELEC 11, the boot process is staring normally with resizing,restart and LibreELEC splash screen and after that reboot. From this point is entering a bootloop ( starting, LibreELEC splash screen, reboot). The red LED is always on, the blue LED is on from when the display is tuning on until the reboot ( display is turning off). In some situation the reboot is happening without LibreELEC splash screen, only "LibreELEC (imich): nightly ........" text is appearing.
P.S. Thank you for your work for this type of boxes ( Rk322x CPU); a lot of this boxes were save from the e-watse.