Hi guys i'm a new user from Italy, so i'm sorry for my english and I hope you can understand...
I have a crazy corona v6 with sk hynix emmc...a customer brought me it telling that after a wrong update (360 already had rgh) it didn't boot more (but i think he has bought it as a damaged console), he doesn't have the original backup of the nand.
At first I wrote Xell and tried to boot the 360 to grab the cpukey without success, then i discovered that even the glitchip was faulty so i replaced it with an Ace v2 and then xell booted. So I rebuilded a freeboot image with the extracted cpukey and then flashed it to the console. 360 booted fine into NXE, then I decided to apply offline avatar/kinect update and now problems came...at first 360 was extracting the update but then, after the reboot, only black screen.
So i tried to flash again the freeboot but this time in Jrunner and Autogg emmc is detected as removable and there is no more mb dimensions, however i was able to write the image successfully. Then I start the 360 and initial configuration starts (language selection, etc...), but after the configuration only black screen, if I try to boot again, after 360 logo, another time black screen. If i flash the freboot I'm able to do initial configuration every time but then only black screen. Sometimes after flash Xell works, other times 360 didn't even boot if i press eject.
I have also checked resistors near the emmc and on the bottom (near r1r1) but they are all ok...the only thing I can imagine is that emmc is corrupted.
If someone have had similar problems or an idea would be great, this evening I will also post some pictures...