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Microchip's Accessory Framework for Android(tm)
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Open Accessory project:
? http://developer.android.com/guide/index.html
? http://developer.android.com/guide/topics/fundamentals.html
? http://developer.android.com/resources/tutorials/hello-world.html
6.1.3 Updating the Android OS
Description
This section describes how to update the Android device to the versions required for use with the Open Accessory
framework.
6.1.3.1 Nexus S
This section covers how to update the Nexus S to Android OS version 2.3.4.
Description
1. Look at the phones current version number by going to “Settings->About Phone->Android Version”. If the version number
is 2.3, go to step 2. If the version number is 2.3.1, go to step 4, if the version number is 2.3.2, go to step 6, if the version
number is 2.3.3, go to step 8, if the version number is 2.3.4, then skip all of these instructions and just go to the
firmware/APK file installation instructions.
2. Download the following file to your computer:
http://android.clients.google.com/packages/ota/google_crespo/a71a2082d553.signed-soju-GRH78-from-GRH55.a71a208
2.zip
3. Rename the file update_v2_3_1.zip
4. Download the following file to your computer:
http://android.clients.google.com/packages/ota/google_crespo/353e267378cd.signed-soju-GRH78C-from-GRH78.353e26
73.zip
5. Rename the file update_v2_3_2.zip
6. Download the following file to your computer:
http://android.clients.google.com/packages/ota/google_crespo/98f3836cef9e.signed-soju-GRI40-from-GRH78C.98f3836c.
zip
7. Rename the file update_v2_3_3.zip
8. Download the following file to your computer:
http://android.clients.google.com/packages/ota/google_crespo/a14a2dd09749.signed-soju-GRJ22-from-GRI40.a14a2dd0.
zip
9. Rename the file update_v2_3_4.zip
10. Now connect the Nexus S phone to your computer. Enable the USB Mass Storage drive support on your phone (if it
doesn’t pop-up with the request, then slide down the notification bar from the top to enable it).
11. Copy all of the .zip files to the root directory of the drive created by the phone.
12. Make sure that the phone as at least ? of a charge left. Disconnect the phone from the computer.
13. Turn the phone off by holding the power button and selecting the Power-off option.
14. Hold down the up volume button on the phone.
15. While still holding the volume up button, press and hold the power button. The phone should boot into a boot loader
menu. You may now let go of the buttons.
16. Use the volume down button to go to the “Recovery” option of the boot loader. Press the power button. This will make it
appear as if the phone is rebooting. It will stop at a screen that has a triangle with a “!” mark inside of it.
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