安装Install Android 7.1 on Ouya

Caution: Proceed at your own risk. This process has a higher chance of potentially bricking your Ouya console. This process uses a modified version of TWRP recovery that switches the cache and system partitions. Make absolutely sure that you follow the steps exactly and that Ouya boot menu gets installed as it can allow to get back into recovery should something go wrong

Things You Will Need

• A USB flash drive, at least 4 GB of free space https://amzn.to/3wkR5ju
• A USB hub, preferably with external power https://amzn.to/3KTviDw
• A USB keyboard https://amzn.to/3qgUQTe | https://amzn.to/3uchJs

Prerequisites and Downloads

1. Download i12bretro_OUYA_Android7_commands.zip Download
2. Download i12bretro_OUYA_Android7_image.zip Download
3. Format the USB flash drive to FAT32
   1. Right Click Start > File Explorer
   2. Right Click the USB flash drive > Format...
   3. Select FAT32 from the File System dropdown
   4. Make sure Quick Format is checked
   5. Click Start

4. Extract the downloaded i12bretro_OUYA_Android7_image.zip file to the root of the USB flash drive
5. Extract the downloaded i12bretro_OUYA_Android7_commands.zip
6. Safely remove the flash drive and set aside for later

Installing Ouya USB Drivers

1. Right click Start > Command Prompt (Admin)
2. Paste the following commands to disable driving signing checks temporarily
   bcdedit -set loadoptions DISABLE_INTEGRITY_CHECKS
   bcdedit -set TESTSIGNING ON
   shutdown /r
3. Your PC will reboot
4. Connect a USB cable from the micro USB port on the back of the Ouya to your PC
5. Connect the USB hub to the USB port on the Ouya > Plug in the USB keyboard and prepared USB flash drive
6. Make sure the Ouya is connected to a display via HDMI
7. Power on the Ouya
8. After a few seconds you should hear Windows chime that a new device has been detected
9. Right click Start > Device Manager
10. Expand Other Devices and you should see OUYA listed
11. Right click OUYA > Update Driver
12. Select Browse my computer for driver software
13. Click the Browse... button
14. Navigate to the extracted i12bretro_OUYA_Android7_commands\files\driver
15. Click OK
16. Make sure "Include subfolders" is checked, click Next
17. Windows should find the correct driver for the Ouya and install it
18. Navigate to the i12bretro_OUYA_Android7_commands in windows explorer
19. Right click i12bretro_OUYA_Android7_commands.bat > Run as administrator
20. The script uses the Android Debug Bridge (ADB) to boot the Ouya into TWRP recovery
21. When the command prompts to "-- Setup the fastboot driver", go back to Device Manager expand Android Device
22. Right click Android Bootloader Device > Update Driver
23. Select Browse my computer for driver software
24. Click the Browse... button
25. Navigate to the extracted i12bretro_OUYA_Android7_commands\files\driver
26. Click OK
27. Make sure "Include subfolders" is checked, click Next
28. Windows should find the correct driver for the Ouya and install it
29. Press Enter at the command prompt once the driver is installed to continue booting the Ouya to TWRP recovery

Restore i12bretro Android 7 Image via TWRP Recovery

1. With the OUYA in CWM Recovery:
2. From the main menu select Install zip > Install zip from USB disk
3. Select UNOFFICIAL-twrp-3.2.3-0-SxC-ouya.zip
4. Select Yes to confirm installing recovery
5. From the main menu select Install zip > Install zip from USB disk
6. Select ouyabootmenu-mql-v2.0.4.zip !!!This is critical!!!
7. Select Yes to confirm installing Ouya boot menu
8. From the main menu select Advanced > Reboot recovery
9. The Ouya should reboot into TWRP recovery
10. Click Restore
11. Click Select Storage > Select Storage 1
12. Click 2020-05-17--20-43-21_N9F27M_test-keys
13. Make sure System, Cache and Data are checked > Using the mouse slide Swipe to Restore
14. Click the TWRP logo in the top left to return to the main menu
15. Click Install
16. If you are not already viewing Storage 1, Click Select Storage > Select Storage 1
17. Select UNOFFICIAL-twrp-3.2.3-0-SxC0-ouya.zip
18. Click Add more Zips
19. Select ouyabootmenu-mlq-v2.0.4.zip
20. Click Add more Zips
21. Click ouya-keylayouts.zip
22. Using the mouse slide Swipe to confirm Flash
23. Click Reboot System
24. After a few moments the device will boot into Android 7.1 Nougat

Cleaning Up

1. After successfully flashing the image to your Ouya, do the following
2. Right click Start > Command Prompt (Admin)
3. Paste the following commands to re-enable driving signing checks
   bcdedit -set loadoptions ENABLE_INTEGRITY_CHECKS
   bcdedit -set TESTSIGNING OFF
   shutdown /r
4. Your PC will reboot

Source: https://forum.xda-developers.com/ouya/development/rom-android-7-1-nougat-ouya-t3927878