UPDATE: Downgraded to 8.0.2b and I get the same result when trying to copy to nand. All I get is a black screen when I try to boot from the nand; no boot logo, nothing, just pure blackness. When I put the USB stick that has LibreElec on it, it boots up fine from the USB stick.
Any suggestions? As I stated previously, I've had these builds running off the internal disk before I tried to update to 8.0.2d.
Update 2: Thanks kszaq for updating to 8.0.2e. Not sure what you changed, but I updated to the latest version and used the MXQ Pro 4K device tree and now we're back in business. I was able to install LibreElec on the internal drive and works great!
Thanks again for your hardwork.