OK, that explains why you are still encountering the "can't set com-state" error. You have version 3.9.2024.9 of the CH340 driver. This means you have not managed to install the version 3.7.2022.1 of the driver, or if you installed it, the installation was not persistent (e.g., Windows immediately updated the installation back to the latest version 3.9.2024.9. The "roll back" instructions I provided are expected to install version 3.7.2022.1 in a persistent manner.
It is possible this problem is caused by not correctly following the instructions I provided. I suggest you try following the instructions again, being very careful to follow them exactly. When I follow those instructions, they do result in the persistent installation of version 3.7.2022.1 of the driver.