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Then after repartitioning of a microSD card, move content of a /boot directory to a new boot partition you made on a microSD card using mv /path/to/new/root/boot/* /path/to/sdcard/new/boot . Of course, don’t forget to add a boot mount to a fstab file: UUID=xxx /boot vfat defaults 0 0 . cmdline.txt So, the main part is done, now it is time to tell Raspberry where is a root partition.