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user_twk15
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Monday, July 13th, 2026 12:57 AM

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Ubiquiti UCI stuck at 40Mbps upload

I’ve got a 2 gig plan (my account says ~2300 down and ~300 up), but my brand new Ubiquiti Cable Modem is stuck at 1400 down and 40~43 up (the upload is what I’m concerned the most).

I tried help representative and they are 100% certain this specific modem is not capable of higher speeds - they double checked and cross checked. They eventually sent me to “tech department”, which was a bot that concluded it must be a problem with my Wi-Fi setup. I have screenshots if that helps.

 This modem is certainly certified for next gen speeds, but i can’t break that helpdesk wall.

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Updated 

14 hours ago

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XfinityMelinda

Official Employee

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260 Messages

4 days ago

Good evening! Thank you for posting on our Xfinity Community Forum. We can certainly understand your concern, especially regarding the upload speeds you're seeing on a modem that is certified for our next-generation speed tiers. Based on our approved-device information, your modem should be capable of supporting speeds up to 2.33 Gbps under the right conditions. 

Here is our article that lists modems that work with our speed tiers: https://www.xfinity.com/support/internet/customerowned

To help us better understand what's happening, can you let us know:

  * When did you first notice the slower upload speeds?

  * Does this happen all day, or only during certain times?

  * Have you tested while connected directly to the modem with an Ethernet cable, and if so, are the results the same?

We'll be happy to take a closer look and help determine what's impacting performance. Let us know!

 

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user_twk15

Visitor

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5 Messages

Thanks for looking into this, but I was finally able to get through The Iron Wall of Helpdesk and they finally (after talking to 5+ representatives who each tried to sell me your XB8 modem) uploaded "premium bootfile" and a day later it started working.

Thanks.

4 days ago

0

XfinityJosephA

Official Employee

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2.3K Messages

 

user_twk15 thanks for your update and patience. I'm glad service is now working properly! What upload speed are you now getting? 

 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please mark as Best Answer.tick

4 days ago

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user_twk15

Visitor

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5 Messages

I’m getting up to 2336/304/14ms and my plan promises 2278/293/13ms.

Not bad, but a far cry from symmetrical FTTH at 4ms I used to have from AT&T several years ago. Still happy to not be stuck in low-split speeds.

4 days ago

0

XfinityJosephA

Official Employee

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2.3K Messages

 

user_twk15 that does look at lot better with the service you have! Are you testing with an Ethernet cable? We just want to make sure we do all we can to help. If you need anything else before we close out this post please let us know. 

 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please mark as Best Answer.tick

4 days ago

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user_twk15

Visitor

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5 Messages

I’m testing this right at the router.

Unless you’re willing to install proper fiber (FTTH) to my house, then I’m good for now. You can close it. Thanks!

4 days ago

0

EG

Expert

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119.3K Messages

14 hours ago

Solved topic now being closed.

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