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I started to install the ubuntu touch image and once the ubuntu touch screen came up with the logo and one of the options was to restart, so I restarted it and now it is stuck on the Google screen. I have the Nexus 7. I can't try to install ubuntu or android on it now because it has to be on in order for me to use adb. Please help. Hope I didn't brick my Nexus 7

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Have you tried holding the Volume down and power at the same time while turning it on? – BiggJJ Jul 5 '13 at 19:15
I have. It will go into fastboot mode – Michael Platt Jul 5 '13 at 19:16
you came use fastboot command to install a new rom fastboot flash system /path/to/system.img – BiggJJ Jul 5 '13 at 19:19
Do you not have recovery installed? if so you can flash a new rom with the. This is the preferred way. – BiggJJ Jul 5 '13 at 19:20
@MichaelPlatt Can you please add the information to your question instead of the comments? It's hard to follow exactly what's going on here if the question is never updated! – Jorge Castro Jul 5 '13 at 23:17

If you recently installed Ubuntu Touch to the Nexus 7 (using build 20130704.2), the device may be (temporarily) bricked.

.. endlessly cycling between the Google boot logo and a blank screen ..

Step 1.

Wait for the screen to go blank, and then ..

Press and hold Power + Volume Up + Volume Down buttons, for 5-7 seconds.

( This may take a few attempts. )

You should now be at the Bootloader screen ('green START' )

Step 2.

Use the Volume Down button twice, to show 'Recovery Mode' (in red)

Then press Power, to restart in 'Recovery Mode'.

This will first show the Google logo for 4-6 seconds ..

Then change to Recovery Mode (with a Ubuntu logo in white circle).

Step 3.

You should now be able to verify a USB connection.

adb devices should return 'recovery'

You can now download a fresh install to device.

Make sure only the target device is connected. This will not verify the device attached, and will simply install software for a Nexus 7 (grouper).

phablet-flash -b -d grouper

If this does not succeed, restore the device to Android (factory) settings.

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what I would do at this point is flash a recovery image using fastboot flash recovery recovery.img Use this link to download the recovery: Nexus 7 Touch Recovery

Then download a rom: Factory Images "nakasi" for Nexus 7 (Wi-Fi).

Boot to recovery and mount as USB storage. Copy the factory image ROM to the SD card.

Then use recovery to install Zip from SD card.

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