In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/sbin/download.cgi line 16:

. /usr/html/axis-cgi/lib/functions.sh

  ^-- SC1091 (info): Not following: /usr/html/axis-cgi/lib/functions.sh was not specified as input (see shellcheck -x).

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/sbin/download.cgi line 39:

recording_files=$($indexer_app $indexer_opt | grep -v "DEBUG:") || {

                               ^----------^ SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

recording_files=$($indexer_app "$indexer_opt" | grep -v "DEBUG:") || {

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/sbin/download.cgi line 53:

	echo ${file#$mount_dir/}

             ^-----------------^ SC2086 (info): Double quote to prevent globbing and word splitting.

                    ^--------^ SC2295 (info): Expansions inside ${..} need to be quoted separately, otherwise they match as patterns.

Did you mean: 

	echo "${file#"$mount_dir"/}"

For more information:

  https://www.shellcheck.net/wiki/SC1091 -- Not following: /usr/html/axis-cgi...

  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...

  https://www.shellcheck.net/wiki/SC2295 -- Expansions inside ${..} need to b...