Ok so I noticed everyone. Ok so ALMOST everyone seems to have the same problem. So I read around and figured a LOT of u seem to be messing up at some really easy and basic points. I'll just tell u a few of the more common ones.

1. Check ur SD card. R4's that can use an SDHC card will SAY it can use a SDHC card because u will actually SEE SDHC written on the box and on the card. And if u go on the site it will tell u too... Problem is, if u don't find a SDHC written anywhere, it means u have the older generation of the r4 card and only SD card (which is only 1 or 2 GB) can work on it. If you already bought a SDHC card without realizing relax~ it's easy to sell it off and a SD card is cheaper than a SDHC~ seeing as SDHC usually has a larger memory. ;p

2. Plug ur memory card into ur computer (via USB or sumthing). DON'T plug it into ur r4 just yet and DON'T put any games on it just yet (if you have... don't panic, I'm only saying this because sumtimes it might hurt the card... like, chop a few MB's off or sumthin.. no real harm). Format the card. Right click, go down the list and press format. A thing-ey pops up and then u check list of formats u can format it to. Click either FAT or FAT32. A fast format is fine. Click ok and wait for it to finish formatting~ ^^

3. Check what r4 u have. CHECK IT! Ur looking for the firmware that has EXACTLY the same name as urs. If it doesn't, it's not the right one honey. There are DOZENS of different r4's out there now and it's VERY confusing. Especially since they all have very similar names. TYPE the name of ur R4 word for word when u search for firmwares and only click on ones that have the same name as urs.

4. Always download the latest version of firmware for ur R4. There are a bunch of confusing numbers behind the R4 firmware name right? That tells u how updated it is. For example u could get 1.71 and 1.81 etc. right? (THESE AREN'T REAL!!!) 1.81 would b da updated one... usually... look out for dates too. It's kinda hard for a 2008 firmware to be able to play 2009 games etc so u might need to update it too. Usually it's safe to ignore the in between yearly updates (like eg. 1.81.2, 1.81.3 etc) unless u hav troubles playin sum later games in the year~

5. Keep a back-up of all ur games (that's the stuff u download and play with the .nds behind it) and a back-up of all ur save files (that's the stuff that appears after u've played the games and has the same name as ur game - with a .sav OR .SAV etc behind it). Sumtimes a game f*cks up and sumtimes u updated ur R4 with the wrong firmware. It's rare but that can mess up ur game and sav file. Not to mention sumtimes save files delete when u accidentally mistreat it... (get water on it, drop it on the ground etc...) and some games just tend to get glitchy. Like pokemon... (where u might need to constantly update ur save file)...

6. When the game u download doesn't work, sometimes it's ur game that's the problem. There might be sumthing wrong with ur download (the internet cut off in the middle, the server reconnected. etc) try re-downloading it first~ If that doesn't work then the problem lies with THEIR version of the game. Look somewhere else. If you downloaded from several sites and they don't work then u need to get an update on ur firmware~

Well~ I'm only going over some of the very basic's of what seems to be going wrong according to a lot of you guys' comments~ ;p Good luck~ don't get caught by ppl when using ur R4~ ^^ If it's ur first R4 card then this information is all pretty new and kinda hard to take in, just take it slow and read FAQs they have on sites like these when things don't work... Your problem can usually b explained on them. If nothing on there works, THEN start asking on forums. Later~ once u get ur head around it u can find the fun in other things~ like cheats, patched files etc~ >:D