Hello, Ninh Giang Thi!
To convert back the configuration that is created for 8.3.5 to make it available to be edited in 8.3.4, you can do the following:
- Create the new infobase for 1C:Enterprise 8.3.5.
- Load the configuration dump into it.
- Change the compatibility mode to 8.3.4.
- Save changes.
- Set the 1C:Enterprise version to 8.3.4 in infobase properties.
Note that if the configuration uses some features of 1C:Enterprise 8.3.5, you will have to provide a replacement that will work in 8.3.4 instead of those features.