Netgear CM2050V upload speed not performing

I had a tech come out and they confirmed that the output of the modem is 2000 down and 41 Up. So there is a profile/boot file issue with this modem. PLEASE FIX THIS COMCAST

araposo8 Thank you for following up with us and letting me know the technicians findings. With our gigabit x2 speeds the upload offered is 300 Mbps. I'm sorry that you are not seeing that speed on your devices. I know how important it is for our services to deliver 100%. I would love to help out and make sure that we have this corrected. 

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I sent a chat message. Thanks

Now  that Xfinity finished testing and has deployed in areas the latest firmware for the Netgear 2050V (Cable Firmware Version V10.01.03) are there plans to test the 2050v for the Next-Gen Speed Tier?

This would give the higher upload speeds.

Anon7568482 thank you for using the Xfinity Community Forums page to reach out. A specific timeline on when such test could/would take place is not currently available. 

Hi edjames! Thanks for reaching out on our Xfinity Forum, letting us know you're also running into upload speed concerns. We appreciate you providing some insight on your experience and some things you've done on your end in trying to rectify this. Please know my team is here to support you.

I do want to confirm, currently, are both the upload and download speeds closer to where they should be on your end?

We look forward to hearing back from you!

@XfinityAmira​, yes I'm finally getting the advertised Gigabit X2 / next gen speeds with my CM2050V.  Hopefully nothing will happen that causes the UL speed to drop back to 40 mbps.

@edjames​ This sounds very promising. Just spent a couple hours with Comcast chat where they said, the 2050V is not compatible with their 2100/300 plan, and of course I need the voice line for for some older modem thing that works great with it currently (doesn't work with AT&T VoIP as they compress evidently).

Going to try and unplug and wait a few minutes, though like my Comcast "region" in the SouthEast hasn't staged the new firmware or something yet. Grrr. The tech sent an "Advanced Reset" heh. Still stuck at 41Mbps upload... though did improve download from 2050 to exactly 2100.

Thanks for letting us know, @edjames! That is excellent news. Our team is great to work with because we'll remain here, on this platform, to support you and your household however we can, should anything else come up. And if you do have more questions or concerns arise, please feel free to create your own new post to ensure we get to it quickly and properly address things regarding your particular account, service, and equipment. Thanks again!

Ha! The install the CODA56 modem (using Xfinity app to Add Device) and let that get all setup and show the 2100/300 really does work (actually getting 2150-2200Mbps down and 350-360Mbps up), and then swapped back to the 2050V and I'm still getting the 2100/300 AND I have my telephone plugged in like I need. I hope this is permanent! Though in reality, unless the AT&T Gig Fiber 5000/5000 up/down is having an outage (knock on wood, only been a couple times (back when it was 2500/2500) and great for last year+ at 5000/5000)... I don't need this as much as I need the phone line. If there is ever an extended AT&T fiber outage, then maybe I'll swap the CODA56 back in.

But instead... I just hope Comcast can make sure this is permanent and I don't have to worry about it! :-)

Fascinating (and great) that the Coda56 swap and then going back to the CM2050V fixed it for you as well.

So far, my UL speed has not reverted back.

Now if someone would see if unplugging their CM2050V for an hour or two also results in higher upload speed.

No issues.  I've been getting the rated X2 speeds for several weeks now.  Fingers crossed that it will last.

Agreed. Even if I could afford it, I don’t want to have to swap to get the speed again. It should just work like it did for those couple of weeks before going back to the slow speeds.

@user_sofe5w​ 

Did the tech figure it out? 

It clearly works at higher speed if you use a different modem and then plug it back in. Well for a while (days/weeks) and then drops back down to 41Mbs.

Annoying. I would rather it not work at all than clearly be some firmware version or config setting that could be adjusted. :(

If they just had a telephony adapter that was separate? Then I could use the CODA56 modem that works at 300Mbs upload speeds and the adapter for VoIP.

Hello, user_sofe5w! We appreciate your feedback and the opportunity to help in every way we can. Please send a direct chat message with your full name and complete service address to “Xfinity Support”. To do so, click on the chat icon located at the top right of this forum's page.

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I am using a Netgear CM2050V cable modem and started out getting 1200Mbs down an 20Mbs up on a 1Gbs plan for the last couple of years.  Earlier this year (2025) I got a message that Comcast had upgraded my speeds for free.  My download went to 1300Mbs and my uploads went to 40Mbs. 

Within the last few weeks I noticed my uploads are now over 300Mbs so it seems they finally got the CM2050V to work correctly on uploads.

I am currently running this firmware version.

@NetGeekJay​ They FIXED it. The tech who came out got it raised up to a "Level 3 network engineer" who looked at it, and apparently the boot file that Xfinity had pushed to my CM2050V was incorrect. The engineer was able to identify a specific problem with it, correct it, and re-push the new boot file to the modem, and we immediately started getting the 2Gbps/300Mbps speeds that we are paying for. FYI for anyone else with the problem, the "regular" 800 number troubleshooters have NO IDEA what they're talking about when they want to "push a refreshed boot file" - it does not work. The engineers have to CORRECT the file, then push it. Good luck everyone!