Just wanted to share my experience for those coming here due to this problem:
managed to install Nextcloudpi to several different SBC but failed on odroidHC4
even though there’s a current image ( Index of /downloads/NextCloudPi_odroidHC4_12-12-20/ )
Problem was, the odroidHC4 never gave the option to boot from SD
(the net install at the boot menu through exit / “netboot_default” gave the option to install debian 10, 11 or ubuntu), but no chance to boot from the prepared image (yes, I did change the boot to boot from SD - no success)
The solution is as easy as it is hard to find and is base on incompatible petiboot:
(at the very bottom)
in short:
boot menu exit to console and execute following commands:
flash_eraseall /dev/mtd0
flash_eraseall /dev/mtd1
flash_eraseall /dev/mtd2
flash_eraseall /dev/mtd3
exit and reboot, enjoy starting your NCP from SDCard