I'm running on a two month old nightly because flashing a zip in either recovery or fastboot has been failing since then. I thought that maybe I was getting bad downloads, or my recovery needed to be updated. Then I got lazy and let it sit for a while because things have been working well enough that my weekly/bi-weekly nightly updates weren't all that pressing.
Then I heard 4.4.4 was a thing and decided to give it a go again. Well, updates still fail in TWRP without any specific error. Weird. Let's try fastboot! Nothing like the good-old brute-force method: Sending... FAILED: Remote not allowed. The hell...?
This literally shouldn't be happening. Bootloader is unlocked. I have root. I'm 1.54 hboot S-ON (factory default from a swap, I got screwed). I'm also not having any issues with drivers or OS problems either. And yes, I'm running CMD as admin, USB debugging is enabled and linked to the PC I'm doing the work on.
By all accounts, I should NOT be having this problem. What gives? Halp? I'll provide anything you need. I'm not even going to bother wasting my time with ADB/Sideload because I'm likely going to get the same errors/failures.