I responded to you in your original thread: viewtopic.php?p=16105#p16105

You need to use the Tune Customizer, not the Tune Editor. You can find it under "My Current Car" on the Home tab of VersaTuner. Then click "Edit Settings", open "Disabling DTCs" tab and click "Advanced". You will need to select all DTCs that you want to disabl...

Torque limiter disable functionality has not been available on Mazda RX-8.

You can disable DTCs using the Tune Customizer feature. It can be combined with any tune. Please note that it is your responsibility to ensure that all applicable emissions laws and regulations are strictly followed.

MegaSpool is only available on Mazdaspeed6 and Mazdaspeed3. RX-8 has regular launch control.

1. Is the ignition on? Try identifying the car with the engine running. 2. Try installing VCP driver, it worked for some users: https://ftdichip.com/wp-content/uploads/2021/08/CDM212364_Setup.zip 3. Try a different computer 4. Try using contact cleaner on the OBD-II port and make sure that the cable...

Looks like you didn't have the original backup and VersaTuner only has the USDM stock tune built in for the Mazdaspeed6.
I have emailed you a tool to flash the European stock tune.

VersaTuner cannot edit an existing tune on the car and it does not allow disabling the DPF and EGR on SkyActiv-D engines.

The error means that the security access key for the ECU has been changed and VersaTuner cannot get access. I suspect that the file that was flashed was not stock. It is best to remove VersaTuner by using the "Return car to stock" feature in VersaTuner and not using a 3rd party bench flash...

You need to adjust the relay temperature triggers. You can look up the ECT sensor volts vs coolant temperature in ECT Sensor calibration table.
See this picture for details on what each relay controls: