How to calibrate thrustmaster hotas4?

The Thrustamster software does not have a calibration option, it just shows you that the various axes and buttons are responding.

It’s a useless piece of software. It also removes the option of going to the Windows joy.cpl where you can calibrate it.
You need to uninstall the Thrustmaster software, restart your PC and then you can calibrate it in the Windows joy.cpl app.

I had an Hotas X and this worked fine for me. I even contacted Thrustmaster about the issue and they responded saying they would look into it.

Have now moved on to a Honeycomb Alpha, which if you can get one or can afford it, I would highly recommend.