Sorry, I have tried to install the RUU through the install menu, it just said failed. Ive tried to sideboot and my computer gives me an error saying "cannot read" i successfully pushed it to /data/media/0/ as a zip file. and yes I did have it in the ADB folder. I dont have an SD card reader, I used an old android instead. Is that more helpful? I apologize, I should have been more descriptive.
Just for general info though. If it was a custom ROM you pushed, make sure it's one that is for your devices current firmware and not a newer ROM on older firmware else you WILL have issues with Radio(No bluetooth, wifi, data, gps etc).