Default [Q] Unroot GPE M8

I know there is multiple threads that I have read through regarding the unroot process but it seems like I have not found a definitive thread for someone looking to unroot an original GPE M8 that has a GPE ROM installed. Im not talking about anything being converted over the Sense, im talking everything still all GPE..I have mine running Sinless ROM (GPE version) and I am wanting to unroot and bring back to 100% stock. Has anyone done this yet and if so could you please show me the process of how it was done? Been trying to figure this out for awhile now and I would greatly appreciate it!
Current phone: OnePlus One (Sandstone 64GB, Stock CM11s w/Franco Kernel)
Current Tablet:
Nexus 7 2nd Gen- Scott's CleanRom
Previous Devices: HTC One M8 GPE, Galaxy S5, 64GB, LG G3, HTC One M8, Note 3, iPhone 5S, LG G2, Note 2, Galaxy S4, list goes on......