Cannot Export/Import other Joomla Database

Hello,
Please share your backend & FTP login credentials via Contact us form along with the Json file you are trying to import. We'll look into it.

If i try to either Import the Database via a JSON file i exported directly via MySQL i get the Following Error:
0 syntax error, unexpected '->' (T_OBJECT_OPERATOR) (see also in the attachments).

I have the same Error when i try to Export this Database directy via vData.

my Joomla Version: 3.8.6 (vData is running here)

Joomla Version of the Site i want to Export: 3.4.8

FYI what i want to do:
ou previous Webmaster is killing the Site and i have to import it so we can continue to use it.

Thanks
Roody