Har du testat att flasha stock i download mode via fastboot?
https://developers.google.com/android/nexus/images#yakju
http://developer.android.com/sdk/index.html
Process (Byt ut filnamnen mot de du laddade ner från googles servrar):
Kod:
1) Take a Nandroid Backup if you have CWM installed
2) Extract the content of the Google Image
3) Copy the contents of the Fastboot download to the same folder as where you extract the Google Image too.
4) Boot your phone into the Bootloader mode
5) Open up Command Prompt or Terminal, navigate to the folder you've extracted it all too and enter the following commands waiting for each to finish
Windows
fastboot-windows flash bootloader bootloader-maguro-primekk15.img
fastboot-windows reboot-bootloader
fastboot-windows flash radio radio-maguro-i9250xxkk6.img
fastboot-windows reboot-bootloader
fastboot-windows -w update image-yakju-icl53f.zip
Linux
./fastboot flash bootloader bootloader-maguro-primekk15.img
./fastboot reboot-bootloader
./fastboot flash radio radio-maguro-i9250xxkk6.img
./fastboot reboot-bootloader
./fastboot -w update image-yakju-icl53f.zip
OSX
./fastboot flash bootloader bootloader-maguro-primekk15.img
./fastboot reboot-bootloader
./fastboot flash radio radio-maguro-i9250xxkk6.img
./fastboot reboot-bootloader
./fastboot -w update image-yakju-icl53f.zip