The CM-7000PAL DVR never had any firmware updates over its product lifespan. The Channel Master CM-7000PAL DVR was an exact "clone" of its predecessor, the Dish DTVPal DVR, with the exceptions being the "Channel Master" name on the front of the device, the menus showing Channel Master (instead of Dish) and a different color scheme for the menus. P Smith points this out in his previous post above.
The DTVPal was introduced in December 2008 with firmware version F201 installed. When the first units started to arrive at purchaser's homes, firmware version F202 was already available. Over the next 7 months (through July 2009) Dish continued to work on the firmware and subsequently released firmware versions F206, F207 and F208 (the latest/final version to date). Firmware versions F203, F204 and F205 were never publicly released on the Dish website and were only internally used by Dish to "polish" the firmware.
The Channel Master CM-7000PAL DVR was released with firmware version F400 which for all practical purposes is the same as the Dish F208 firmware (with the exceptions noted above). While the Channel Master F400/Dish F208 firmware is not perfect in all aspects, it is believed that Dish/EchoStar felt it was "good enough" and no further revisions were ever released. The fact that both products have been discontinued leaves very little hope for any further firmware updates at this time. In addition the Dish DTVPal website no longer even offers the F208 firmware for download which suggests that customer/technical support for this product has been totally abandoned by Dish/EchoStar.