Decompile Windows EXE File

Hello,
There is a windows EXE file that I need help to decompile. Then I need you to find the area of the code that is responsible for the following:
1) How is tip data CRC calculated?
The device has detachable tips. Each tip has a microchip in it. I can easily read the data on the tip using I2C protocol. But the data on each tip has a CRC. When I reprogram the tip data to something else, the machine rejects it because the CRC does not match. I would like to learn how to write the correct CRC to the tip when I change the data on the tip.
2) How to unlock the device.
Sometimes the device locks and requires a code from the manufacturer to unlock it. The code is different each time. I would like to learn how to generate the code to unlock the machine.
3) I would like to know if the code has any way for me to go into a diagnostics or technician mode to allow me to see energy output readings from the tips. Some of the tips give error codes on the device when their energy output is too low.

If you are able to do this project, I will send you a link to down the EXE file and all other associated files that are on the device.

I tried to decompile the EXE with ILSpy and JetBrains dotPeek 2019 but neither of them could decompile it.

Thank You.