The Internode Mirror contains a wide selection of software for download by Internode customers.
File Download Mirror Directory Listing
Index of /pub/linux/debian/dists/oldstable-proposed-updates/main/installer-armhf/20210731+deb11u7/images/u-boot/Cubietruck_plus/
Index of /pub/linux/debian/dists/oldstable-proposed-updates/main/installer-armhf/20210731+deb11u7/images/u-boot/Cubietruck_plus/