MCU Protocol error

I currently have a ticket for issues with SV08 and eddy. # 114-8013052-4929830 SV08

They had me try this :If you need to revert to the original proximity switch, you can reinstall the proximity switch and re-flash the firmware to reset the printer to factory settings.

Firmware file download address: firmware - Google Drive Looking forward to your reply. Please feel free to contact me if you have any questions.:

and now I get the MCY Protocol error.

Everything was working great until three months ago, when I tried to restart a print and then I :Tip Code 121 or 123. error: so I tried a new eddy from sovol and still same issues no matter what the settings were. So I then decided to just switch back to the default probe that came with the SV08 print before upgrading it. and NOW I cannot get anywhere with it.