If you’re encountering Black Desert Online error code 12009, you’re not alone. Many players have reported this issue. It usually appears during game installation or when trying to install a new patch.
The most common cause of this error is a remnant version.dat file. However, there are a few other potential causes, such as corrupted DNS cache, antivirus interference, proxy servers, etc.
No matter what the cause, we’ve compiled a list of the best workarounds to help you fix this error code.
Troubleshoot To Fix Black Desert Online Error Code 12009
Fix 1: Simply go to C:\Program files\x86\Black Desert Online, and rename the version.dat. file.
Fix 2: Check your device antivirus program settings, and add the BDO under as the exception.
Fix 3: Flush the DNS cache.
Fix 4: If you are using VPN or Proxy then consider disabling them.
Fix 5: There are three primary ports that need to be accessible in order to connect to BDO game servers or update the game on a PC. If these ports are not supported by UPnP or are closed, you may encounter this error. The most popular ports for TCP and UDP are 8888, 9991, and 9993.
Fix 6: If the error still persist then contact the game support.
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