f1gogata If you have been running Oleg's older RK images I have no understanding of how the board is booting or what u-boot versions are installed, but you probably need to a) erase the vendor u-boot that Khadas oocrap installed to SPI flash, as this has boot priority over the emmc device, and b) ensure an LE image has been written to emmc using dd to ensure u-boot 2026.01 is present on emmc to boot the device once SPI flash has been erased.
To erase SPI flash, run dd if=/dev/zero of=/dev/mtdblock0 bs=1M from any Linux OS that boots.
To write LE to emmc, boot an LE image from SD card or USB stick (so emmc is not in-use) then transfter a current LE13 image over to the /storage partition and use emmctool to write the image to emmc.