Mine is modded. I elaborated on it all already and why it's so great. (I really should get around to making a video of it.)
The cable part isn't too hard. No soldering required. I made my own cable. What I did is buy a 3rd party Xbox controller, and a Male-to-female USB cable. You cut the cords on both. Then you expose the wires inside by using an exacto knife to remove the outer rubber layer. On the inside of both is probably some braided metallic shielding, peel that back. Then, you wire the end with the Xbox controller port plug to the end with a female USB connector. The cables are all color coded, or they should be, inside both cables. You wire red to red, black to black (or blue if one is blue), green to green and white to white. The xbox controller will probably have yellow inside it. Yellow is not used.
The plus side of this method (spare Xbox controller) is that, if you wire up the male end of the usb extension cable to the Xbox controller in the same manner, it should function as a PC USB gamepad.
The rest of the stuff all has to be done in software, and that's likely the reason your transferred saves aren't working. See this link
. You cannot just put the game save on a thumb drive. First, you have to format the drive to function as an xbox memory card. Also, not all USB thumb drives/flash drives will work. Your best bet is with an older one. I used a very old Sandisk 2GB drive that's my brothers, that he probably got in 2006. I'd say, the newer the drive and the larger the capacity the less chance it will work. I used this same drive for my PS2 modding, to transfer game saves from gamefaqs to the PS2 memory card using Ulaunchelf. I've tried newer drives and they didn't work. Anyway, the software stuff requires that you do some stuff on your PC using a couple different programs, some kind of action replay program for PC. Also, I personally used the Splinter Cell exploit. I don't know about the other methods.
Once you actually get the SID running, and mod your box, that's where all the fun begins. That means, yet more time and energy to set up everything you want on it. This means finding emulators, getting XBMC, and so on and so forth. If you guys get your boxes modded and want the names of the emulators I use, just ask.
is the first thing you'll want to get.
If you have more questions, pm me.