Intermittent arming issue (T Pro, ELRS 3) and model mismatch

[wicked epoch]

Hi there,

I came here because one of last things I did to my setup was update to ELRS 3.0 on my TX (Jumper-T-pro)

I set up binding phrases on both my quad (Mob7 whoop) and TX (which were already bound using ELRS 2.x)

Now when I try to fly, I sometimes get an issue where the quad won't arm. Turning the quad and Tx on and off a few times resolves it.

If I check the channels on the TX LCD, I see the arming switch works. It also triggers "armed" in the lua script.

The lua script also says "model mismatch" regardless of whether I can arm and fly the quad or not

I'm very confused!

[acoustic notch]

turn off Model Match (set it to Off) if it's enabled.. then in the cli of the drone, set expresslrs_model_id=255 then save

!spi

[crude echo]

https://www.expresslrs.org/hardware/spi-receivers/
Flight controllers with built-in ELRS SPI receivers are not flashed using ELRS Configurator, the ELRS firmware is "baked in" to Betaflight. Thus to update your ELRS firmware, you'll need to flash the latest version of Betaflight for your FC. Betaflight 4.3.x is compatible with ELRS v2.x.x, and Betaflight 4.4.x is compatible with ELRS v3.x.x.
In Betaflight 4.4 and newer, the binding phrase can be set directly on the receiver tab in Betaflight Configurator.
In Betaflight 4.3, the binding phrase needs to be set via CLI. Enter it here and paste the resulting code in the Betaflight CLI: https://www.expresslrs.org/hardware/spi-receivers/#binding-phrase