EFI upgrade instructions are given here.
If System Settings does not show OEM updates, go to App Store and search Sequoia (or newer macOS).
If OEM update fails, make sure SecureBootModel is Disabled and/or reset NVRAM and perform the update.

2024-12-15

Supported macOS Version: 10.15, 11, 12, 13, 14, 15
Intel Wi-Fi is NOT supported on macOS 15 (Sequoia). Try itlwm + HeliPort or Ventura kext + OCLP (risky)

Upgrade

• Update OpenCore v1.0.3 (up to acidanthera/OpenCorePkg@b70d558)

Change

• Downgrade VoodooI2C v2.8 but compiled with VoodooInput v1.1.6 to support macOS 15, solve unresponsive trackpad brought by v2.9.1 #766