So is this only a firmware upgrade that any MSS can handle?

I just traded my Bluetooth wireless mic kit. I had this for about four months, and it works great...just not for my line of work. I'm a reserve police officer, and the first night I used it...the mic unsynced from the radio and I had no mic use. I was on a fight in progress call, and wasn't able to ...

I have a CDM1550ls, and I discovered I cannot add an MDC system on the conventional channels. I have heard the rumor that with the latest firmware upgrade...Moto fixed this and allowed access to MDC on conv. Any truth to this?

Thanks,
BAX