I have a $4 TI Launchpad with a MSP430 processor. The 2553 is a little bit too new for mspdebug however. (It has a Forth flashed into it. See
Anyway I discovered that I could not use mspdebug to reflash the program unless I cheat by telling mspdebug that it is another processor.
So (on a Ubuntu 10.04.4) I can reflash by
sudo mspdebug --fet-force-id MSP430FG4618 rf2500
and then interactively:
There is no action needed to tell mspdebug where to find the device. Also modem-manager (contrary to messages) doesn't mess anything up.