Pololu Orangutan USB - Manual (Page 27)

If COM1 through COM4 are all in use, you have three options:
1) find a way to free up one of those ports by disconnecting something
2) find another terminal program that will let you send binary files to ports greater than COM4
3) reassign your programmer to an “in use” port that you know nothing is currently connected to.
Note that if you choose option 3, you might run into problems in the future if you ever simultaneously connect
your programmer and the other device that is configured to use that port. Once you have chosen your new port,
click OK on both the Advanced and Properties windows and close the Computer Management window. If you
re-open Computer Management window, you should see your serial adapter mapped to your newly selected port.
8.b. Uploading the New Firmware
Pololu Orangutan USB Programmer User's Guide © 2001–2011 Pololu Corporation
8. Updating Your Programmer's Firmware Page 27 of 32