Flash Firmware

Flash Heltec V3 or V4 directly from the browser via Web Serial API.

Web Serial not supported

Use Chrome or Edge on desktop for flashing.

Connect USB

Select port

Flash

Which board do you have?

The revision is printed in small type on the back of the board, next to the GPS connector, as “HTIT-WB32LAF V4.3” or similar. Firmware for the wrong revision boots, but drives the amplifier from the wrong pin — the board hears worse or does not transmit. A 433 MHz V3 board needs its own “V3 · 433 MHz” firmware: its channels are on different frequencies.

Erase the whole board — tick this if the board used to run Meshtastic or MeshCore: their leftovers in memory break the Bluetooth connection. MeshTRX call sign, key and other settings will be erased too.

Firmware v4.4.37

Pick a board first

Idle0%

Pick your board, connect it via USB and click "Select port"