6 months old isn't too late to get that ear up. Keep posting. It isn't ready for breathe rights. You mentioned something about your vet...is the vet the ones that posted the ears up to this point? Or have you?
You have to keep posting. Check out the link Kratty posted to help you learn how to post or try to find a reputable Doberman breeder near you to help you with this problem. It is a good one. Here are some other links:
http://www.dpca.org/BreedEd/ears1.htm http://www.rockytopboxers.com/Earwraps.html
Some use tampons, some use paper towel rolls, some use backer rod. The type of tape you choose to use is important, it shouldn't hurt the ears. J&J Sports take is a good one. You can also put small thin pieces of paper towel with antibiotic under the tape if you have a small sore that needs to heal. The key is small. If the ears are infected, smelling, they need to air out before you do anything.
Keep up with the posting and know you can get them to stand!

Don't feel bad about posting, done properly and with the right materials, it isn't painful & doesn't bother the puppy at all.