Slow download and upload issue

I have Cisco DPC 3010 modem. Download is about 4 Mbps and 6 Mbps upload. Today tech from cox came and checked all cable and replaced few but no change. Per the tech, all signals are fine and have opened ticket for network team. I came across some firmware issues resulting in slow speed. My questions are below. 

A) how do you check what version of firmware on Cisco modem?

b) how do you upgrade or downgrade? Problem recently started.

c) are there any settings n modem? If so how do you access it?

thanks for your help!