I see you have made good progress.
The 60Hz thing I think maybe more of a problem than PAL. My tv will show 50-60Hz and Pal, but this was not always the case. My older tv's will only display 60Hz.
Some images will display the Mode (HDMI or other) and the Hz on the big screen in the front of the receiver. Look for that next time you go searching for new images.

Alos, Maybe learn how to make back-ups of images that you can load from the front thumb drive. These back-ups can be configured for your system and are fast way to recover the receiver. IMO, E2 is a very good OS once you understand it and know its quirks and limits. EB