Because ONLY Android versions 4.4.2 and L get this luxury. How do I know this? Well, I've tested this on almost half a dozen different Android phones.
Enabling 1080p (and 480p) playback in YouTube is frustratingly simple, and WORKS ON ALL 1080P ANDROID DEVICES WITH YOUTUBE v5.7+!!
So let's get into it! FYI, you need ROOT for this tweak:
------ALWAYS BACKUP YOUR BUILD.PROP BEFORE EDITING IT-----
I'm not responsible if anything goes wrong on your phone. This is dead simple though, and if you create a backup there should be no problems
1: Open your build.prop file, and find this line:
(With "x.x.x" being your current Android version number)
2: Then, replace that "x.x.x" with "4.4.2". The line should look exactly like this, (without quotes of course):
3: Save, then reboot your phone.
4: Open up YouTube, play a 1080p video, and select 1080p from the resolution menu.
Note that this will make Settings and all other apps think you're on 4.4.2. However, your phone will still be on whatever version you started with (this isn't just gonna magically upgrade your OS XD). In order to revert back to stock (you must temporarily revert back to install OTAs), restore your build.prop backup or simply change "x.x.x" back to what it was before.
--If this helped you please leave a Like and share it with your friends! If you do mention it somewhere, please give me/this thread credit --
EDIT: So far, I've only posted this on here and the OnePlus forums (under the same username).
UPDATE: According to a couple people on the forums, Google has fixed the issue on their side so that you can see 1080p regardless of your Android version. Unfortunately, my only device now (the LG G3) is still on 4.4.2 so I can't test it. Also, I'll leave this guide up in case anyone still has issues
Sent from my LG G3 Cat.6 using Tapatalk