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I already have a Ubuntu Phone up and running on my Nexus 4. Now I wanted to update it with "phablet-flash" which tells me:

error: insufficient permissions for device
Error while executing adb shell getprop 
Make sure the device is connected and viewable by running 'adb devices'
Ensure you have a root device, one which running 'adb root' does not return an error

"adb devices" shows:

List of devices attached 
????????????    no permissions

I'm using a different PC than I used for installation.

How do I get access to the phone again so I can do an update?

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Check the permissions on the current p.c. – wojox Jul 15 '13 at 13:09
Could You please be more specific. – user175353 Jul 15 '13 at 14:39

I don't have a Nexus 4 (only 7's and a 10) to test this, but ..

Step 1.

Re-start the device:

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

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 4 (mako).

phablet-flash -b -d mako

UPDATE (10-Aug-2013 onwards)

syntax now changed to:

phablet-flash cdimage-touch -b -d mako

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

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