Update Firmware stuck on Downloading...(%0) page

Firmware Version : 2.11.164
I am upgrading firmware via web after plugging the box back.
It says:
Firmware update version found:

After pressing Install and Reboot the page is stuck on Update Firmware stuck on Downloading…(%0) page

What should I do?

I got it working.
The problem was that my disk was full because iSCSI took all the space and despite turning it off it did not release it. I had to do rm /mnt/HD/HD_a2/.systemfile/iscsi_images/NAME.img
And then updating kicked it.