[Q] Issue sideload 5.0.2 OTA - /system/bin/install-recovery.sh has unexpected content topic

I'm trying to apply the 5.0.2 OTA on my wife's Nexus 7. When I try and sideload the OTA, I get this message:

Code:

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"/system/bin/install-recovery.sh" has unexpected content

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It was rooted previously so inside Super SU, I used the 'full unroot' option then tried to apply the OTA again. Same results. I also made sure to reflash the stock recovery in case that had anything to do with it (I was using WUG toolkit which was booting into stock recovery, but just in case...). Same results.

I've seen other reports of applying just the system.img file from inside the factory image. (Here and Here)

Is that a solution that would work for me? Is anyone else having this same issue and has a solution for it?

I could do a factory reset, but thats sortof a pain in the butt I'd like to avoid if I can...

Thanks,
Zeustopher