I just succesfully updated my gnex using Touch CWM (184.108.40.206) without losing recovery!
Please note this requires stock IMM76I except for recovery. You can achieve this by flashing the 4.0.4 factory image (don't forget to remove the recovery).
Decided to create an insecure boot.img for the new release. The boot.img was pulled from the official factory images and ro.secure has been set to 0.
So now you can obtain ADB root priviledges.
Please do not attempt to flash this if you don't ...
This build seems to automatically turn high-res graphics on in the Launcher (even though the switch says its off).
1. On Homescreen press the menu button
2. Goto Launcher Settings
3. Turn Hi-res graphics on
4. Turn it back off