The 285 is an improvement over 284. it is currently available only in the PUFF boot version. The following URLs will get you all that you need to convert or to just install a 284 or 285 BIN for your old 2500 or FLU.
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Please read the instructions properly in the section you have chosen. PLEASE DO NOT ATTEMPT WITHOUT READING INSTRUCTIONS.
There is a a DIY method for converting and installing any of the 2700 group of receivers, i.e. genuine 2700, clone 2700 and converted 2700. [link removed] This has been developed by Tronic
You will need the latest genuine Pansat 2700 284 BIN from: http://www.future-fta.info