[Q] I'm in a bind, need temp root topic

OK, so, I messed up a bit.

My phone works nearly perfectly. In fact, I would say perfectly aside from being able to download OTA updates.

A while back I used Stump root to root my LS990.

Everything worked and it was rooted.

I modified my build.prop to make it seem as if it were a samsung phone in order to use the Milk music app.

Once I had finished fooling around, I used SuperSU to unroot, only to remember a day later that i forgot to restore my build.prop.

I cannot re-root due to the version incompatibility I created by modifying build.prop.

Is there any way to gain temporary root access so I can restore the original build.prop?

Thanks for your help