ok I can confirm it works better .
just typed "sudo dd if=rkspi_loader.img of=/dev/mtdblock0 conv=notrunc sync " waited about five minutes and rebooted.
After 5 reboots it has always go on .. so probably it is better. Ah my os is armbian jammy 22 , I used file from ubuntu rockchip 23, nvme lexar
I wonder if works on all version , and how it differs. but it is rather low level buissnes.