Like many others, I have been facing this strange problem. Whenever i click on the link "Upgrade the system firmware" on the general setup page, I get a blank page. Therefore, I am unable to upgrade the firmware.
I think my web files relating to firmware updation are corrupt. I request you to share the following files so that I can fix my system.
These files are located at /usr/www/ptpl/en
I also urge you to share if your firmware updation link works properly and does not lead to a "blank page"
Thanks in advance,