If you are rocking an iPhone 8 or iPhone X, this is the golden era. You have the ability to jump between iOS versions, jailbreak different firmwares, and truly own your hardware. The "fixed" downgrader makes this more accessible than ever, but it still requires a steady hand and a lot of reading.
If the downgrader tool doesn't meet your needs, you can use these manual methods within FL Studio: flp downgrader fixed