EFR32 Legacy Reference

This page captures legacy settings and jumper references for retired EFR32-based coordinators.

Historical reference only

These settings apply to older 6.9.x firmware and pre-2021 Home Assistant builds. Current models usually do not need them.

Legacy Jumper Reference (EFR32 Pro and Series 2)

Zigbee serial routed to Ethernet (ESP32):

Jumpers toward the ESP32 route Zigbee serial to Ethernet.

Zigbee serial routed to the onboard USB serial adapter:

Middle jumpers route Zigbee serial to the USB adapter.

ESP32 flashing mode:

Ground IO0 during boot to enter ESP32 flash mode.