Thank you for the post. What is the board model you have?
Just to double check if BIOS A and BIOS B using the same version? What is the the version of BIOS A and B?
Did you try un-installing the driver prior re-installing, please try if this will work for you.
A this issue happened after the BIOS repair on the system, have you tried contacting the board vendor as I219-V is integrated on the board. The driver posted on our website is generic version, it is still recommended to contact the board vendor for customized driver.
The bios versions were not the same at first - side A is 1.7 and side B is 1.5. I flashed side A to version 1.5 to see if it'd work, but no change.
Then I started with uninstalling the drivers.
It seems like the driver did not completely uninstall. At least once, I tried uninstalling through safe mode and deleted all of the folders. Each time I rebooted it said the drivers were there. I contacted the manufacturer of my motherboard (MSI Z170A XPOWER GAMING TITANIUM EDITION) and they did not seem to know what it was and offered to do RMA.