Motorola MB8611 Modem Upload Speeds

I have had this modem for several months and it is working well, running software version 8611-19.2.18.  Average download speed in the mid-900's and upload speed locked at 18 Mbps.  My internet plan has potential upload speeds of 200 Mbps.  Xfinity has put out a list of "next gen" modems that have the OFDM/OFDMA upload channels - (Recommended Devices for Our Internet Plans)  capable of getting the upload speeds I am paying for.  But, apparently, the Motorola MB8611 does not have that technology.  So, even though the advertising for the Motorola MB8611 claims upload speeds of up to 800 Mbps, I am only getting 18 Mbps.

My question is do you know when the Motorola MB8611 will get a firmware update that will make it compatible with the Xfinity technology so that I can get the upload speeds I am paying for without having to purchase another new modem?

Thanks!