In /logs/firmware/patool_extraction/DUMP/mtdblock8_unblob_extracted/mtdblock8_extract/0-9650176.squashfs_v4_le_extract/etc/openssl/checkCrt.sh line 5:

keyMd5=`openssl rsa -noout -modulus -in "$1" | openssl md5`

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

Did you mean: 

keyMd5=$(openssl rsa -noout -modulus -in "$1" | openssl md5)

In /logs/firmware/patool_extraction/DUMP/mtdblock8_unblob_extracted/mtdblock8_extract/0-9650176.squashfs_v4_le_extract/etc/openssl/checkCrt.sh line 6:

crtMd5=`openssl x509 -noout -modulus -in "$2" | openssl md5`

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

Did you mean: 

crtMd5=$(openssl x509 -noout -modulus -in "$2" | openssl md5)

In /logs/firmware/patool_extraction/DUMP/mtdblock8_unblob_extracted/mtdblock8_extract/0-9650176.squashfs_v4_le_extract/etc/openssl/checkCrt.sh line 8:

[ "$keyMd5" == "$crtMd5" ] && exit 0

            ^-- SC3014 (warning): In POSIX sh, == in place of = is undefined.

For more information:

  https://www.shellcheck.net/wiki/SC3014 -- In POSIX sh, == in place of = is ...

  https://www.shellcheck.net/wiki/SC2006 -- Use $(...) notation instead of le...