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I had this exact issue with the unit in my dec 45e. ended up marring the silver volume ring from the pliers despite wrapping cloth around it. one guy drilled a small shallow hole in the middle of the original black on/off button and popped it off (it's like a button cap). he was then able to snap the crystal button on. he never removed the silver volume ring.
I actually found a European head unit from a Polish BMW parts site that already had the crystal volume button. everything about it looked the same as my US unit, but I could easily remove its silver volume ring without any tools. WTH?!
during the attempts on my unit, the whole volume assembly and the black trim behind it came out together. one small retention tab broke on the trim, but it didn't affect fitting it back on. I took the whole volume assembly/trim from the European unit and placed them onto mine.
Car Analysis accepted the return of the crystal button I never installed.
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