In essence EPG Refresh is just a channel zapper. You have to activate/select certain channels to absorb the EPG from the satellite, so it fulfils that function.
I am not familiar with Dreambox OS. Do you not have an EPG settings menu where you can enable the various EPG readers?
Edit:
If so, you have to enable the Freesat reader as well as OpenTV EPG reader ( if the image has it). After you enable them, you have to zap to following channels
- SKY UK : Channel name: IEPG Data 1. Satellite: 28.2E Transponder details: DVB-S, 11778 MHz, Vertical, 27500 Symbols, FEC 2/3.
- Freesat (28.2e) : Satellite: 28.2E, Transponder details: DVB-S, 11426 MHz, Horizontal, 27500 Symbols, FEC 2/3.
Note: Although Freesat EPG is on all transponders, it is at slow speed. The above transponder allows fast absorption.