From the MS website:

"Here are instructions for using Hyperterm.exe for updating the embedded software (all Windows installations has the Hyperterminal application - use a "find-file" function to search for "hypertrm.exe"):

# For Version V1.01 boards, short out the bootloader resistor (R6) on the board, for Version 2.2 put on th Bootloader jumper pin, hook upa serial cable from the computer to the MS box, and fire up Hyperterminal (Hypertrm.exe). You do not use the PC Configurator to perform the firmware upload - this is done with the terminal program Hyperterm (or similar, see below), and do not havePC Configurator, MegaTune, or any other serial data application running on your PC. At this point, leave the MS unit unpowered.

# You will see a Hyperterminal screen when you execute - type in any name you want in the box, and make sure the Red telephone with the little yellow telephone next to it is highlighted.

# Now, a new screen appears. On the "Connect Using" selection, select either COM1 or COM2, depending on your serial connection.

# New screen with comm port settings pops up. Select 9600 baud, 8 data bits, no parity, 1 stop bit, and set flow control to "None" - this is very important.

# Hyperterm terminal screen is now up. Apply power to the MS board, then hit . You should see the "Boot>" prompt appear in the terminal screen. Type "H" and you will be shown the options available in bootloader mode.

# Hit "W" for "Wipe" - this erases the entire flash array (except the section running the bootloader).

# Hit "P" for "Program," which will respond with the text "wait ...". Then under the "Transfer" menu, select "Send Text File..." (do not use the "Send file" mode - you are sending a text file). Set "Files of type" to "All files" and select the .s19 file containing your assembled code (megasquirt.s19).

# You will see no activity on the screen for about 40 seconds. Then the prompt will come back, which means the operation is finished. Turn off power to MS and shut down Hyperterminal. Remove the jumper, and you are ready to go.

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