Your Hisense has an excellent panel (QLED, 4K, 120Hz) but a locked brain. Don't try to perform brain surgery on the TV; just plug in a smarter brain via HDMI. That is the "jailbreak" that actually works.
Before discussing a "jailbreak," you must understand what Vidaa is. Many consumers confuse Hisense’s lineup because the company builds different OS versions for different regions: hisense vidaa jailbreak