Is it possible to fix this lollipop problem without root?

I have an enterprise device (TC 70) and have just upgraded to Lollipop using the image the manufacturer provide. In recovery mode I see the error: "e: failed to mount/persist" in recovery

I'm now without wifi / bluetooth for which they provide zip files for, and they run successfully, but I'm still without wifi. I'm assuming as it's to do with the persist directory as the mac info is stored in there.

There's a page I've found:

Is it possible to fix this unable to mount error without root as the bootloader is password protected?

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