BetaFPV Micro TX stop working

[frosty marsh]

Hi I am currrently strugeling with my TX. I wanted to update it to elrs 3.x. It was on 2.3 so I put the 2.5.2 then the repartioner then 3.2.1. Then I had the message "No handset" that persist even after put it the radio and also if I downgrade it to 2.5.2 or earlier, to get reed of I need to reflash the original firmware.
Now I am back on 2.3 and it don't bind with my quads with the same setup I was before the upgrade.
For RX I have a BetaFPV nano, a BetaFPV lite and a matek r24-D.
I upgrade only the nano one to 3.2.1 and it does not work but I suppose a 3.x RX cannot bind with a 2.x TX.

I hope some of you could help me to figure out what could be done to work hopefully in 3.x

[drifting hound]

what options did you set on the tx firmware when you flashed the module to 3.x?

have you tried only flashing 3.0 first?

or 3.2.0 (instead of 3.2.1)?

have you tried flashing via USB/UART (which doesn't need repartitioner or 2.5.2 firmware)?

No Handset message means that the module is NOT getting valid CRSF packets from the radio

[frosty marsh]

I tried with a binding phrase, the setup of my home WiFi, and the non eu regulation then without the binding phrase and the home WiFi

[drifting hound]

so UART_INVERTED is unchecked?

which shouldn't be (default)

UART_INVERTED must be enabled/checked on modules you intend to use with opentx/edgeTX radios

[frosty marsh]

At the first atempt I just try to flash from 2.3 then from 2.5.2 to 3.0 to 3.2.1 then I tried from 2.5 to 2.3.1 version by version

[frosty marsh]

I tried both on each methods

[drifting hound]

but if UART_INVERTED is unchecked, then it will not work with your OpenTx/EdgeTX radio

which radio were you using it on?

[frosty marsh]

So do I need to change my baudrate to a more suitable one by default is 115k and for 3.x I put it on Max value

[drifting hound]

115200 just doesn't cut it anymore

[frosty marsh]

Yes all the other option was by default

[drifting hound]

reflash, via USB/UART
with UART_INVERTED CHECKED/ENABLED
and set your radio baud rate to at least 400k

[frosty marsh]

Qx7 accst on the latest version of edgetx

[drifting hound]

enable one-bit sample mode from the Hardware menu..
and consider doing the crossfire mod if you haven't yet

[frosty marsh]

Were could I find it that the first time I heard about the one-bit sample

At the Time my radio IS in full stock and I did not do the Crossfire mod

[drifting hound]

This would also apply to the QX7 in part
https://www.expresslrs.org/hardware/x9d-troubleshooting/