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I would encourage you to check out this post and post what you can.
Spectrum-Social Media Customer Care
Lead Moderator-Community Forums
But my upload speed is far too low only getting 10mbps upload speed with 400mbps download. From what I read it says to update firmware but it says I can't update it manually. Do I need TWC to do that or do I need to go through netgear?
You have already said that you measured your download speed at 400 Mbps, which is proper for your package. Please answer a few quick questions so we can help you:
1) What is your ZIP Code?
That lets us find the upload speed for the 400 package in your area.
2) What upload speed did you expect to have with your 400 package?
HINT: The answer for 400 down is NOT going to be 400 up.
3) You said the model number of your present modem is Technicolor TC8715D.
Did you buy it yourself or get it from Spectrum?
4) Where are you reading about a need to update firmware? As others said, Spectrum will push out the latest version received from TC that Spectrum has tested and approved.