So pissed off and annoyed now....
Attempted to upgrade to marshmallow, then tried root over and over again. I get that it's a wip, but no such luck. Eventually I got annoyed and decided to just wait so I tried downgrading back to 5.1.1. For some reason now trying to root that results in boot loop as well (even tried older supersu). After a couple attempts with no such luck, tried to install stock back and now before even trying to root, the device doesn't want to boot up properly anymore.
I tried fastbooting bootloader, boot, recovery, and system, once I try to staRte up normally, android boot logo goes through but the first startup "upgrading apps" goes through its list and right after finishes, says "starting apps" but almost immediately boots back to the boot splash screen, where the process repeats itself over and over.
Trying to reflash everything results in same issue now. I've tried at lEast 4 times. Have I bricked my brand new nexus player?
Hoping for some answers so I can sleep on it. Pissed off and annoyed now. Ugh.