In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/html/activex/decoder/h264_dec.cab line 3:

if [ -n "`echo -e`" ]; then

         ^-------^ SC2006 (style): Use $(...) notation instead of legacy backticks `...`.

               ^-- SC3037 (warning): In POSIX sh, echo flags are undefined.

Did you mean: 

if [ -n "$(echo -e)" ]; then

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/html/activex/decoder/h264_dec.cab line 4:

        echo_e=echo

        ^----^ SC2209 (warning): Use var=$(command) to assign output (or quote to assign string).

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/html/activex/decoder/h264_dec.cab line 12:

DECODER_SIZE=`ls -l "$DECODER" | sed 's/ \+/ /g' | cut -d ' ' -f 5`

             ^-- SC2006 (style): Use $(...) notation instead of legacy backticks `...`.

              ^--------------^ SC2012 (info): Use find instead of ls to better handle non-alphanumeric filenames.

Did you mean: 

DECODER_SIZE=$(ls -l "$DECODER" | sed 's/ \+/ /g' | cut -d ' ' -f 5)

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/html/activex/decoder/h264_dec.cab line 14:

CR=`$echo_e '\r'`

   ^------------^ SC2006 (style): Use $(...) notation instead of legacy backticks `...`.

Did you mean: 

CR=$($echo_e '\r')

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/html/activex/decoder/h264_dec.cab line 55:

allow=`/bin/parhandclient --nocgi get $PARAM - RAW`

      ^-- SC2006 (style): Use $(...) notation instead of legacy backticks `...`.

Did you mean: 

allow=$(/bin/parhandclient --nocgi get $PARAM - RAW)

For more information:

  https://www.shellcheck.net/wiki/SC2209 -- Use var=$(command) to assign outp...

  https://www.shellcheck.net/wiki/SC3037 -- In POSIX sh, echo flags are undef...

  https://www.shellcheck.net/wiki/SC2012 -- Use find instead of ls to better ...