nexus 7 crashes on trying to update to andriod 4.4.2

Hi I have a new version Nexus 7 which crashes every time I try to update it to Android 4.4.2
I have done a factory reset but its still the same, I understand you can flash it  with an image of Android from a pc using
using a boot loader, can you do this and what’s the cost please
cheers Barry

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