The 8910 can definitely send the B&O 455KHz signals. Here's what you should do to make progress.
Post at hifi-remote.com in the
Code Search forum. Read the sticky, and fill out the template listing that you have a 8910, a JP1 cable, and the equipment that you have. Also post a link to this thread.
Upload into the Diagnosis File Section (at hifi-remote.com) your IR data file so that we can see exactly what you have uploaded into the remote. Include a link to your IR file and to the upgrade file that you used. I suspect that the BEO4 remote upgrade should work--at least partially-- and so perhaps there is some error in carrying out the upgrade of your remote.
THe CCF and Pronto Hex codes here should be useful, but decoding them into a form for use in an upgrade may take some work. Posting at hifi-remote.com will make sure that some experts will see your problem.