[Q] Nexus 7 restore to factory

Hi - My sister has asked me to take a look at her Nexus 7 as she wants to upgrade it to the latest Android version. Unfortunately she bought it second hand and it had been rooted. It also seems to have the clockworkmod boot loader.

I'm having issues just trying to get this thing un-rooted and back to factory as it will not install the Android 5 update. I have used the Nexus Root Toolkit and all goes well right up to the part where it puts the device into recovery mode - my PC loses its connection to the Nexus and then the connection attempt times out. I have downloaded the Android 5 zip from from google and put it on the phone, then booted into recovery mode and tried to install from the zip. I just get an unhelpful 'Installation aborted' message. just not sure as to where to go from here..,.

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3508j root
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