Instructions to upgrade the 7852-400 modem firmware: 1.) On your hard drive, create a new directory called "C:\FLASHPRO". 2.) Download the utility file "FLASHPRU.EXE" into the new directory. 3.) Download the firmware, "BM316DHX.EXE" or "BM416DHX.EXE", that you want to flash into your modem, into the new directory. 4.) Extract the utility file within the FLASHPRO directory by typing "FLASHPRU". 5.) Extract the firmware file within the FLASHPRO directory by typing "BM316DHX" or "BM416DHX" as appropriate. 6.) In that directory type FLASHPRO. Example: 7.) Select "Configure" from the menu. Select your active port, default is COM2. Leave the Baud Rate at 115200. Leave the Device Type at MODEMFILE. Hit ESC to exit "Configure". 8.) Select "Select File to Program" from the menu and hit return on the file to flash in. 9.) Select "Program Firmware" from the menu to flash the modem. 10.) Watch the messages in the green area to observe the status of it programming. 11.) Hit ESC to exit flashpro.