My Xbox 360 doesn't turn on anymore

[Farid*]

My Xbox 360 just doesn't turn on anymore; it seems it is dead completely!

My Xbox 360 specs :
Jusper
512MB Nand
Manufactured Date : 2009/08/11

The story beyond it went like this :
About one year ago I lost my DVD Key during LT Plus update.
Two weeks ago I wanted to recover my DVD Key with new RGH method.
I started investigating and found out I can dump my nand by USB and LPT.
I build a USB SPI flasher and dumped my nand three times. All of them are identical (they are 553,648,128 bytes)
Unfortunately every time I got some errors from 74A0 to 74A7.
I decided to use LPT method, but same errors came up for that addresses.
Then I updated my dashboard from 12611 to 12625 and then used USB method to dump my nand, but this time I got a lot of errors! (I think that, at this stage I had messed up my nand)
After a lot of works I pushed power button but my Xbox 360 didn't turn on!
I used LPT method to dump my nand again but it also gave me a lot of errors.
I wanted to write my first dump but after a little search on the net I found out this is considered as a downgrade and it mess with something called efuse, so I decided to ask here before doing further destruction!

Now I appreciate anyone who can help me to continue my work!
Thanks in advance

[peshkohacka]

Returning old dash will cause red lights, but the console will turn on, check your traces and see if you ripped out one by mistake.

[Farid*]

Some pictures from my Xbox 360 motherboard :

Front :


Back :


When I update the dashboard I didn't connect the fans. After updating successfully a massage pop up stating that XBOX console is designed in a way to turn off automatically if the CPU gets too much hot! I just ignored the massage and turn off my console.

Can someone tell me which part of nand changes after dashboard update? Maybe I can dump my damaged nand to some extent and mix it with my pervious good nand and use it :
Also which file is containing the DVD Key?

[Farid*]

I read a bit of my current nand with this command :

Code:

NandPro.exe lpt: -r1 microsoft.bin 0 1

I opened it with HxD (Hexeditor), it is full of nothing! All I got is FF.

Last offset of this file is 4200h with 16,896 bytes size.

I opened my previous good dump with HxD and extract 16,896 bytes from its beginning. I named it microsoftw.bin then I wrote it to my nand with this command :

Code:

NandPro.exe lpt: -w1 microsoftw.bin 0 1

Now I can turn on my Xbox but it won't boot and after blinking green light, it gives me three red lights!

Conclusion : I have lost the nand of current dashboard (12625) but still I have a good dump of nand from the previous dashboard (12611)

Please someone answer these questions :
1. Which file of nand contains DVD Key?
2. Which file changes after dashboard update?
3. Now I have to rely on RGH to run the games, right?
4. Can I return my Xbox to its original state after doing RGH successfully?
Thanks in advance

[xboxbreaker]

1. The Keyvault or "KV.bin"
2. Could be one, more likely it will be quite a few, but you can get a copy of the latest retail filesystem in the "usual places"
3. Not necessarily, although you will need to do RGH anyway, so once you have done it don't see much point in undoing it! (me personally)

4. You can build a new "stock" image using the latest filesystem, your xbox's unique files (from your old nand dump) and one of the dash builder tools. GGBuild does it I think, but I'm at work so I cant have a look at the commands needed. Obviously you need to get your CPU key using RGH xell first anyway. If you rebuild a retail Nand, there is no guarantee that your xbox will ever be safe on xbox live. Although it behaves as retail, there may be subtle differences on the Nand that may be detectable.

Why on earth did you update the xbox after getting matching nand dumps?

[Farid*]

I have just KV_enc.bin with 16,384 bytes size. Is my DVD Key inside of this file?! I know this file is encrypted but I am kinda curious if it is possible to use "Relative Search" function of WindHex to recover DVD Key?

I just wanted to update the dashboard and nand, then read the nand again and make sure I have a good working dump!

Questions :
Now I have to follow original guide for doing RHG and get the damn CPU Key, right? 
If so then it seems that I can save my Xbox anyway!
You have shed some light of hope in my heart! I am so happy! Thanks a million! 

[xboxbreaker]

I have just KV_enc.bin with 16,384 bytes size. Is my DVD Key inside of this file?! I know this file is encrypted but I am kinda curious if it is possible to use "Relative Search" function of WindHex to recover DVD Key?

It is inside the KV, but no matter what trickery you try and use on that file you will not get the DVD key. You need to decrypt it with CPU key.

Now I have to follow original guide for doing RHG and get the damn CPU Key, right?

Yes. Once you have the CPU key you can get your DVD key and also build an updated retail image. That will match the CPU fuseset and get it going again. Or you can keep it RGH and have ggbuild. :-)

By the way your original problem with the nand reading gibberish sounds more like you have problems with your set up than the nand itself. So next time you get loads of errors take a look at your USB reader set up (soldering, cable length etc), sometimes they can be unstable. A good way to check is to start a read command several times, and ensure you always get the same valid flash controller number.

Good luck.

[Farid*]

OK, thanks for the help. Now I have my CPU and DVD Key. Please help me to make a retail dashboard of 12625. I couldn't make it with xeBuild-GUI-2.01. It gives me error on 12625 but I could make a retail dashboard of 14719.