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When you make a config the only changes are made in the linuxcnc/configs directory in your home folder.
No changes are made to any system files, none at all. So it doesn't matter how bad a config is made it does not affect anything outside of the above mentioned directory.
PCW is a very patient member of the forum and the guy that runs Mesa Electronics. This is the first time I have show any frustration with a forum member. Ever.
When you have an issue, with anything in this world, diagnosis follows a process. Whilst it may not make sense to you, it does to those offering advice. To go off do something that is unnecessary and you have been advised not is deeply disrespectful and can quite possibly throw a spanner in the works and bring you back to where you started. Eventually people may come to the conclusion that trying to help is not worth their.
The best course of action would be to go back and follow PCE's advice to the letter, do not skip a step.
For a second time does your spindle controller require an analogue voltage, or does it require a PWM signal. Actually it may be an idea to qualify what controller you are using and any documents pertaining to the spindle controller.

I've thought about it for a long time and think I've found a pretty good solution.easy, cheap, rocksolid, no mcu, no IC





signal -> nf-transformer -> rectifier -> transistor (+resistor and capacitor) -> Relais/SSR

Finally I got it working. I shortened the spi cables, reduced spi frequency, tried erasing and flashing remora via stm32cube, nothing worked. But after some time it automagically started working. I don't know how it worked?