I got mine enabled just before the warranty ran out, after a lot of persuasion.. asked on two previous occasions without success. (B&O)
The changes they made to mine were as follows
Address 47: Sound System (J525)
Old:
Part No SW: 81A 035 466 HW: 81A 035 466
Component: MIB2_amp_P_A3 H10 0100
New:
Part No SW: 81A 035 466 B HW: 81A 035 466
Component: MIB2_amp_P_A3 H10 0440
Address 5F: Information Electr. (J794)
Old:
Part No SW: 8V1 035 035 HW: 8V1 035 035
Component: MU-P-LND-EU 052 0679
New:
Part No SW: 8V1 035 035 D HW: 8V1 035 035
Component: MU-P-LND-EU 052 1168
I couldn't believe the difference in sound, now sounds like my sound system had been in a box and now it's out !!
Three years without the sub woofer, I nearly asked them for a refund on the option.