This change may cause problems for some modems, though most major products seem to inter-operate well. If you are having problems making or maintaining connections, it is likely that an upgrade of your modem firmware is warranted. This change to a modem is referred to a flash upgrade. Firmware is the built-in software that controls the operation of the modem.
Some modems use a flash ROM, which is a type of memory for the firmware.
Flash ROM can be erased and reprogrammed, making it possible to update the firmware without replacing the memory chip. Therefore any updates can easily be made through a flash file. It is very important that a flash upgrade be done correctly. Permanent damage can be done to your modem if you do it incorrectly. To begin the process you must confirm the exact make and model of the modem.