Methods
There are several methods used to uncap a cable modem, by hardware, software, tricks, alterations, and modifications.
The first technique (there were others before this) to enjoy any success uncapped Motorola modems (such as the SB3100, SB4100, and SB4200 models). By spoofing the Internet service provider's TFTP server, the modem is made to accept a different configuration file than the one provided by the TFTP server. This configuration file tells the modem the download and upload caps it should enforce. An example of spoofing would be to edit the configuration file, which requires a DOCSIS editor, or replacing the configuration file with one obtained from a faster modem (e.g. through a Gnutella network).
An alternate method employs dhcpforce. By flooding a modem with faked DHCP packets (which contain configuration filename, TFTP, IP, etc.), one can convince the modem to accept any desired configuration file, even one from one's own server (provided the server is routed, of course).
Another more advanced method is to attach a TTL to the modem's RS-232 adapter, and get access to the modem's console directly to make it download new firmware, which can then be configured via a simple web interface. Examples include SIGMA, a firmware add-on that expands the current features of an underlying firmware, and others.
Refer to the sites below for more information and tutorials on the various methods used.
Read more about this topic: Uncapping
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