It will work in 32-bit Cubase without a bridge. 64-bit Cubase will require use of a bridge since Miroslav Philharmonik (I’m assuming you are referring to the IK software) is 32-bit only. The built-in Cubase bridge works with no user input. It’s a bit of a resource hog but it works with it. I don’t use jBridge so I’m not sure if it works more efficiently with that or not.
So, are you trying to use it in 32 or 64-bit Cubase?
If you are certain Cubase is set to look in the folder where the .dll is located and it still doesn’t show you could try deleting the Blacklist folder and restarting Cubase.