A computer to install the AltStore sideloading tool. Process:
Visit unc0ver.dev in Safari on your iPhone and tap to sideload the app. Enable Airplane Mode and disable Wi-Fi. Jailbreak iOS 14.8.1 / 14,8
A8 through A14 (including iPhone 12 series). A computer to install the AltStore sideloading tool
Taurine 1.1.7 is a modern alternative that supports on iOS 14.0 up to 14.8.1. Jailbreak iOS 14.8.1 / 14,8
If running iOS 14.6–14.8.1, open in Checkra1n and select "Allow untested versions" .
Jailbreaking iOS 14.8 and 14.8.1 depends primarily on your device's processor (A-chip version). Devices with older chips have more stable, "checkm8"-based options, while newer devices require semi-untethered apps like Unc0ver or Taurine.
Connect your device via USB (USB-A to Lightning is recommended over USB-C).