Asus ROG STRIX B550-XE GAMING WIFI - Thunderbolt Header; BIOS FlashBack LED

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Chapter 1: Product Introduction
Chapter 1
19. Thunderbolt header
The Thunderbolt header allows you to connect an add-on Thunderbolt I/O card
that supports Intel’s Thunderbolt Technology, allowing you to connect up to six
Thunderbolt-enabled devices and a DisplayPort-enabled display in a daisy-chain
configuration.
PIN 1
FORCE_PWR
GND
SLP_S3# SLP_S5#
GND
RTD3_SW
I2C_SCL I2C_SDA I2C_IRQ# RTD3_POWER_EN S_SLP_S0#_IDLE PERST_N WAKE#
TB_HEADER
The add-on Thunderbolt I/O card and Thunderbolt cables are purchased separately.
20. BIOS FlashBack™ LED
The FlashBack™ LED lights up or blinks to indicate the status of the BIOS
FlashBack™.