The story: I got my R4 Revolution like 2-3 years back. the system file on the microSD has a 2007 date. =P Lately, I got a bunch of ROM for the latest game, and it start giving me errors like data file not found, etc. So I decided to do a few google searches and see what I can do about it. (this is how I find this forum btw.) lord and behold, I read instructions like upgrading to 1.18 (I have no clue what version I am on to begin with), downloading the cheats, etc. But upon turning on my NDS, the R4 tells me something like the hardware isnt compatible with the sofeware in chinese. Question: How do I find out what I actually bought a few years back. and determine the correct way to fix the problem at hand, so I can play the games I gotten recently? Thanks for any help. and sorry for the very open ended question.