Thank you! I have changed the flash to a yet different one and that did the trick. Now the flashing succeeds, SPINAND is selected as the default storage, but the device is not booting from the flash and still boots into MASKROM mode. I have checked and SARADC_IN0_BOOT, SARADC_IN1_RECOVERY have 1.8 ...

I have created a custom board based on the Luckfox Lyra Pi's schematic with the Core3506 module without eMMC, instead I have connected SPI NAND flash.
fspi_schematic.png

When I try to flash the board with rkflash (LuckFox Lyra Zero W firmware or its compiled SDK output yield the same result) it ...