In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/sbin/firstboot line 3:

/sbin/jffs2reset $&commat

                 ^-- SC2068 (error): Double quote array expansions to avoid re-splitting elements.

For more information:

  https://www.shellcheck.net/wiki/SC2068 -- Double quote array expansions to ...