Expresslrs epp2 Matek f405-wse issues

Totally new to Ardupilot. THought I’d give it a go but cannot for the life of me get my tx and rx working. 4.0.9 firmware loaded to board.
Tx16s running Elrs 150hz TLM 1:16

Calibration of board worked, but not a thing workng on Radio page.

Epp1 Elrs rx conected to Uart2 on matek f405-wse board.
BRD_ALT_CONFIG =1
Serial7_Protocal = 23
Serial7_options = 4

Spent 6 hours on this getting nowhere fast.
Any help greatly appreciated.

Updated to latest version firmware and set Protcol = 29 and it’s working know.

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Ongoing issues… Updating has not fixed the problem.
Reflashed board so that I start with a fresh firmware install.
set Brd_alt_config = 1. radio was detected and started working.
Serial7 = -1 !

Disconnected/ switched all off then reconnected and Radio was still working.
A win…

Just swithed everything back on after 5 min and the radio is no longer recognised. No movement in calibration tab at all and I’ve changed nothing.

Help!!

NTOFT, did you ever get this working? I’m trying to configure a Matek F405-Wing, Ardupilot, and ExpressLRS EP1 on Serial5, and having no luck at all. I configured it based on this

and since have tried a bunch of setting variations, none of which made a difference.