cd /opt/Fritzbox-Image
wget -q -O var.tar https://download.avm.de/fritzbox/fritzbox-7530/deutschland/fritz.os/FRITZ.Box_7530-07.29.image
tar -x -f var.tar
rm -r var.tar
mv var/tmp/filesystem.image filesystem.image
YourFritz/bin/squashfs/armv7l/unsquashfs4-le -no-progress filesystem.image
rm filesystem.image
cp /root/image_signing.asc /opt/Fritzbox-Image
cd modfs/
./run_modscripts ../squashfs-root
cd ..
sed -i '150s/export HWRevision/export HWRevision=236/g' squashfs-root/etc/init.d/rc.conf
mv image_signing.asc squashfs-root/etc/avm_firmware_public_key9
ls squashfs-root/etc | grep avm_firmware_publ*
YourFritz/bin/squashfs/armv7l/mksquashfs4-le squashfs-root/ filesystem.image -all-root -no-progress
mv filesystem.image var/tmp/filesystem.image
touch var/tmp/dummy.image
rm var/signature
tar -c -f var.tar ./var/
tar -tvf var.tar
bash YourFritz/signimage/sign_image var.tar > 7530.image
tar -tvf 7530.image
mv 7530.image 7530_729signed.image
rm -r var var.tar squashfs-root