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Upgrading firmware

For old firmware sysupgrade without parameters is enough.

For newer firmware, use it as sysupgrade -k -r to update both kernel and rootfs.

If you got this error:

losetup: /tmp/rootfs.squashfs.${soc}: No such file or directory
Rootfs: Unable to get hostname, execution was interrupted...

then try to update only kernel first: sysupgrade -k

If it doesn’t help, use --force option: sysupgrade -r --force

If you caught a glitch, retrieve the most recent version of the utility:

curl -k -L -o /usr/sbin/sysupgrade ""