epsilon BIOS blocks you from trying to install firmware versions that are not supported by the installed core.
fast forward accepted the new firmware upgrade downloaded last night, and have lost the ability to fast-forward through adverts.
Install Sputnik Agent on an appropriate access point, reflashing the firmware, or purchase such a unit from Sputnik.
I'll also upgrade the firmware to 2.6 from their site.
We will start updating the firmware of these lenses free of charge in the near future.