I would be sure before making a donation that is possible do root on the UE55HU8500 and install the oscam.
I would also like to know if you can go back and restore with original firmware.
I have the firmware ver. T-GFP9DEUC_1370.5 installed on my TV.
You can downgrade to 0000 and install an older firmware.
Than root for example with
[App] "Skype replacement" root H from mihd
This method is for OLD FIRMWARES (T-MST14 <= 2130, T-GFPx < 1290, T-NT14U < 1050, all T-GFS).
Dont forget to block updates.
After that you can install Oscam.
Yes you can remove root..