Easy to see that your GET aren't working as the webserver is returning HTTP status of 301 with a content size of 185 bytes.
In the terminal, if you run ls /var/www/fusionpbx/app/yealink/resources/firmware/T46S-T48S-T42S-66.84.0.15.rom what do you get? @Methodz86
Not sure about @Vishal Pai, but...