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Mount an img file with multiple partitions to edit files in them
sudo losetup 2020-10-23-poppy-torso.img -Pf
ll /dev/loop*

Then find the partition there eg /dev/loop15p2

mdkir -p mnt
sudo mount /dev/loop15p2 mnt/

Edit whatever file you want in mnt/ and unmount it:

sudo umount mnt/

The img file is now up-to-date with your changes.

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