When you go to Devices, and click the "arrow up" to upgrade, you wil first see the release notes. After that you can choice to cancel or upgrade.

@ady23 Did you find the problem in the mean time? I have the same switch TL-SG2008P ( and a TL-SG2008 and TL-SG2218) and using a OC200 controller. I was playing with pfSense yesterday and i had the...