Unroot and Relock your Android device using a Toolkit for Mac OS X.
1. Get Android SDK
* [ Ссылка ]
2. Download Bootloader and stock image
* [ Ссылка ] (Restore/Unroot Nexus 7 to Stock 4.1 link)
* Unzip file
* Move image-nakasi-jro03d.zip to android-sdk-macosx/tools/platform-tools
* Move bootloader-grouper-3.34.img to android-sdk-macosx/tools/platform-tools
* Move Click Me to android-sdk-macosx/tools/platform-tools
Double click Click Me and follow onscreen instructions.
Credits to xda member techfanatic9 for writing the script.
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