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I have been trying to play some new games on my R4 but everytime I create the .sav file the message appears "the save data could not be accessed. please turn the power off and reinsert the DS card". This doesn't happen to any of my other older games. What's going on?

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Update your R4 system files

Posted on Nov 27, 2008

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Honestly, first i would copy al of your ROMs to your computer, and if you want to keep you saved game, copy the .sav files also. Then after that, make sure you have the newest kernel on your computer. Then delete everything on your R4 card. correctly install your kernel on the card again (and if you dont know or remember how to do this, i have written a guide for it) and copy your roms (and .sav files!) back on to your R4 card. PS: it would be better to only copy the kernel at first, load the R4 card in you ds, then after that, load the roms and/or the .sav files.

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Hi, download r4 games some have sav files and some don't. when use nds it creates sav file which takes little longer. any way around this?do some games just not have sav files?what does a sav file do?


The first time you open a game on the R4, it creates the .sav file.  This is the save game file, similar to how the game saves on regular cartridges.

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Cannot play games off R4 mem card


Well just to let you know that R4 is an unofficial product for the DS and so it can sometimes have problems or drawbacks. Chances are when you save the files onto it your micro sd card reader is not corresponding correctly so you may want to either get it checked out or read the instructions and if there is anything you dont understand post it on here. .SAV files are basically save files placed onto the card which just allows it to be ran on the DS. Hope i helped.

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R4 card the save data could not be accessed .


[DS] Cannot access save data fix. Some cards like the R4 and a few other cards have trouble running certain games,
With the exception of one game "Star Wars Jedi Alliance" All games can be fixed to work on these lower qaulity cards.


So why is it broken?
Basicly at some point during development nintendo changed the way save files are handled, saves are handled by a file inside all ds roms called "arm7.bin", older cards such as the R4 and others have no way of reading or using this updated arm7, so the solution is to swap the newer arm7 with an older arm7 taken from a working game.

This is refered to as an arm7 patch, swap or fix.


So how do i fix it?
First of all just try update your cards firmware. Firmwares for all cards


If that doesnt work there are a few programs out there that you can use to arm7 swap, DSlazy and DSbuff.
DSbuff being a more up to date program.
%5b3443%5ddsbuff_small.png

DSbuff v.1 Final link: DSbuff

Extract with 7zip, winrar or winzip: 7 Zip

Pre extracted arm7.bin from Contra 4: arm7.bin
If you download the arm7.bin put it in the folder you create in step one then you can skip step 2 completly.


NOTE: If DSbuff doesnt work properly on your computer *for example the program crashes during the arm7 swap follow this guide for DSlazy* DSlazy links and guide


DSBuff Instructions:

Step one: Set-Up
Create a folder on your desktop and name it the game you want to fix.
Extract DSbuff anywhere and start it.

Step two: Unpacking
Run DSbuff.exe and click browse dsbuffbrowse.png now choose a game you have that works.
Click unpack dsbuffunpack.png then browse dsbuffbrowse.png in the new drop down section.
Choose the folder you created on your desktop
Click "Unpack Checked" and make it so only Arm7 has a tick.
Now click dsbuffunpack2.png

Step three: arm7 swap.
Click the Drive:\ directory up the top or just restart DSbuff and click browse, now select the game your trying to fix.
Click on arm7 dsbuffarm7swap.png then browse dsbuffbrowse.png and choose arm7.bin from your folder you created. Now click dsbuffarm7swaptick.png
Watch the green line to see when its done, it will unpack, then repack then when its finished give you the option of what to name the file.

Congratulations your finished, enjoy your game.

Jan 15, 2009 | Video Game Consoles & Games

1 Answer

Cant use ROM's in my NDS and R4


Hi Patrik,

I have had this problem with several R4 cards that i have mended for friends. Basicly what is happening is a file known as an ARM7 file is not being read properly.

There are a few ways around this problem.
  • You can download a NDS patcher/unpacker and unpack/repack the game that is giving you problems and replace the ARM7 file with one from a working game. (the unpacker will generally come with a working ARM7 file) i use one from GTA chinatown wars.

  • You can go to the torrent site and look for the game you are havong problems with and 9/10 you will find one saying 'R4 fix'

This is a link to a decent site that helps if you wanted to try it for yourself. http://cupevampe.blogspot.com/2007/12/how-to-patch-nintendo-ds-rom-tutorial.html

Good luck

Jan 08, 2009 | Nintendo DS Lite Console

1 Answer

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You must update your R4 system files. Download the latest version from R4.

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r4 with a 2 gb micro sd

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