Those days are long gone, I’m afraid. It’s not as simple as patching an IPSW like it used to be. The jailbreak scene has been pushed to the edge of a cliff by Apple with each update, especially after iOS 10. iPhone 8/8+/X and lower are jailbreakable for life due to an unpatchable bootrom exploit (checkm8), but it doesn’t mean much now that those devices won’t get iOS 17. Recently, Apple added another security measure (cryptex1) to make it near impossible to downgrade. It’s pure luck these days if/when a jailbreak gets released & for what iOS version. Oh and it’s been so long since the last untethered jailbreak, I can’t remember the name of the last one. All of them are Semi-Untethered (sideload an app with the exploit, but you would have to resign it every 7 days in case your phone reboots unless you own an Apple Dev Account)