1. install JDK make sure you get the right version, especially if you are on windows -- there is a 64 bit and a 32 bit install
2. set your JAVA_HOME by right-clicking on "This PC" and selecting properties->Advanced System settings->Environmental Variables. Point to the SDK. For me the path was C:\Progra~1\Java\jdk1.8.0_25
3. Install the Android SDK. I just installed Android Studio
4. Use the SDK manager (under configuration) to download Extras->Google USB Driver
5. Go to your SDK directory (mine was C:\Users\Eden\AppData\Local\Android\sdk\extras\google\usb_driver) and install the USB drivers (for windows right-click on the inf file and choose install)
6. Download the factory image
https://developers.google.com/android/nexus/images and unpack it (you'll probably need 7-zip or similar)
1. Go to settings->about tablet and tap the build number 7 times This will enable the hidden developer options
2. Go to settings->Developer Options and enable USB Debugging
3. Connect the device to your PC using a USB cable
4. You should now have a notification that you are connected as a media device Tap to change to camera
5. Accept the prompt to allow USB debugging
*UNLOCK BOOT LOADER*
1. Run CMD (the command prompt)
2. change to the ADB directory (your directory will have a slightly different path than mine)
3. verify your device is connected properly
4. Now... open the boot loader
adb reboot bootloader
5. once this is loaded you can unlock it
fastboot oem unlock
6. reboot the bootloader
*WARNING* This is the point of no return. Continuing will wipe all data from your device, so if you need to do so, back out and make a backup.
7. At this point Google recommends that you run the flash-all.bat script included in the factory image you downloaded above. I did this and it left me with a tablet that wouldn't boot at all.
8. I panicked, hyperventilated, and was generally pretty upset
9. Once the panic subsides, install the factory image directly. This will vary a bit for different devices, but for the Nexus 7 I ran the following command:
fastboot -w update [image file].zip
10. OK now you wait. This is a large file, and takes some time. Once it is done your android should reboot normally. The first boot should also take a while, so don't worry if it seems to be taking a long time
Pretty scary for a while, but I got through it, and now I have a cool new OS on my tablet. Yes, the Nexus 7 (2012) is a few years old, and honestly mine was getting sort of sluggish -- but my initial experience with 5.0.2 is that the old tablet is much quicker. It's not like buying a brand new tablet with the latest hardware, but if you want to get a few more miles out of that old machine, this is a good option.
Thanks to Android Central for the excellent article
that helped me through the process.
- Grove City College2000
- K&L GatesProgrammer/Analyst, 2007 - present
- USISApplication Support Specialist, 2003 - 2007
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