If you previously downloaded YouTube on this Apple ID, you can sometimes trigger a legacy download.
Video plays audio but black screen Fix: This is rare on YewTube. Force close Safari (double-click home button, swipe up Safari) and reload. youtube for iphone 4 ios 7.1.2 download
While it’s a fun weekend project, remember that the iPhone 4’s A4 chip struggles with modern web standards. Expect some stuttering, and keep your charger handy—streaming video on a 12-year-old battery is a marathon the phone wasn't built to run anymore. TubeRepair If you previously downloaded YouTube on this Apple