I'm really sorry, but I've tried to use your superboot r4 with my second N7 which is grouper with JB 4.2.2, and the result is a bootloop on Google screen.
I unlocked it without problem, but the superboot doesn't want to start.
When I'm in the bootloader, I click to superboot-windows.bat,I have the message "booting downloaded image", after reboot and it's a bootloop
I've tried three times and always same result
I re-downloaded once again, same process as you describe, I have the message by CMD and the message in the screen....and bootloop
I used your superboot with my N7 3G in JB 4.2.1.,it works well, without problem.
Superboot is a boot.img that when booted, will root your device the first time you boot (installing su and the superuser APK). No need to flash any partitions, no need to mess around with ADB, no messing with the contents of your data partition, no overwriting the shipped ROM on your device, just boot the boot image using the instructions below and you're done!
- Download the Superboot zip file above and extract to a directory
- Put your device in bootloader mode - Turn off the phone then turn on with the 'volume up' and 'volume down' buttons both pressed to enter the bootloader (as pictured below)
- WINDOWS - double click 'superboot-windows.bat'
- MAC - Open a terminal window to the directory containing the files, and type 'chmod +x superboot-mac.sh' followed by './superboot-mac.sh'
- LINUX - Open a terminal window to the directory containing the files, and type 'chmod +x superboot-linux.sh' followed by './superboot-linux.sh'
Note: If you are using a retail device, you may need to unlock the bootloader first, using './fastboot-windows oem unlock' (or the appropriate version for your machine, included in this zip). Note that the OEM unlock sequence wipes your device, so consider doing an 'adb backup' beforehand if required!