Posted by hans2 on Mar 23, 2016; 3:15pm
URL: https://itus.accessinnov.com/fw-upgrade-Permission-denied-tp503p512.html

breda wrote

Hi, can you walk be Thu the setups I'm  rookie with command prompts  not sure how to use chmod
Thanks for all the help

source: https://en.wikipedia.org/wiki/Chmod 

basically, use chmod as followed:

chmod <rights> <file>

rights:
644 gives root read/write (6) and the rest read (4) access
755 gives root read/write/execute (7) and the   rest read/execute (5) access
700 gives root read/write/execute (7) and no access for the rest


so in your case

chmod 755 /sbin/fw_upgrade

gives rwx access for root to file fw_upgrade in folder /sbin.

Itus has not been consistent with their scripts, some of them are executable (755) and some of them are not (644).
If a script file (like my .sh scripts) is NOT executable, then you need to start them with "sh /sbin/fw_upgrade"