You may have another issue in your X5. The ULF module itself is not more powerful or "better" in the later generations. There are some reasons to upgrade like text messaging and more data entries.

I believe you may have a failing microphone or failing module. I don't know if it would result in a newer ULF upgrade though.

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2009 E70 X5 - Third Row - Rear DVD
Past - 04 4.4i Sport Package