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