Help with setting up FTXTM

[AlecTBM]

Hello. I installed a Daikin Synergi (FTXTM30S) this summer, and found someone locally that sold a preflashed Faikin with the supposedly correct cable. I bought it (mostly because of lazyness) and I quickly found out that the cable was not correct. When I got the correct cable that fits in my S21 port, it was still not working, and I am suspecting there is more stuff that is wrong.
The seller had used his on a Daikin Emura of the same generation as mine, so I suspect it should be able to work.
The board I have now that came preflashed is an ESP32-C3 devboard, and the cable is soldered directly to the plug (no voltage regulator or levelshifters).

My unit is one of the new versions where the wifi module is integrated and the S21 port is free.
This is how it is connected:

I get the "System is offline (no data tx/rx)."
I did some digging on the board, and found out that the rx/tx pins that I use on the board seems to be ping 20 and 21, but in the settings, the tx and rx is set to pin 26 and 27. I have tried to change it 20 and 21 (and tried to flip tx/rx both set of numbers) with no luck:

But because of this I am also a bit unsure if the rest of the settings are okey.

So I would love a sanity check on the pinout and possibly the config, and some assistance in what the next steps should be.
I am open to reflash the board I have now, I also have some ESP32 devboards I can try, and if there is a fatal flaw in the design here, I am open to buy a new an proper Faikin.

[revk]

The - prefix is an invert, but it normally tries both ways anyway. But not sure which GPIOs you need on that module.

Also, some A/Cs want 5V not 3.3V

Also, some A/Cs need a pull up.

[AlecTBM]

Thank you for the quick reply revk!
Yes I saw that it automatically tried to switch the invert automatically. I will have to investigate and confirm the pin numbers...
In the settings page, should the rx be for the pin that is connected to pin2 on the S21 port? or
When you say pullups, would the internal pullups in the ESP normally be enough? or will in in that case need an external pullup?

[revk]

As for pull ups, maybe for rx, but the issue may be the 5V levels to the A/C. The Faikin board uses a FET to pull down and a pull up to 5V if supplied by the A/C.

Rx sounds right but your pin numbers are backwards, the white arrow is pin 1 which is 5V, so labels right, not pin numbers.

[AlecTBM]

Yes the pin numbers on the drawing I got from the seller is wrong... When I said rx to pin2 i meant the rx to the pin next to 5V.
I think I will start with ordering some levelshifters.