How can I force a firmware re-flash on MacBook 2,1?

I have a MacBook 2,1 2.0GHz Core 2 Duo, Late 2006 model. It has the latest Firmware installed (v1.1) but I would like to re-flash this because I fear it may be corrupted slightly. How can I get round the Firmware update identifying I already have it installed? Surely there must be something I can edit in a plist file which will skip the detection of the current Firmware version (a bit like when you install iMovie '08 on a G4)??
Please help, I don't mind using Terminal if that's the only way round detection.

The problem is I bought a MacBook that has had coffee spilt on it. I've taken it apart and cleaned the logic board and all the connectors. I've got it booting now and installed Leopard on it. The trouble is it won't charge the battery at all. I've tried PRAM and SMC resets which do nothing. Here is a rundown of what it will do:
Boot from PSU - Fine
Boot from Battery - No
Run from just PSU - Fine for about 10 mins then it turns itself off (probably because the PSU alone doesn't provide enough wattage)
Run from just Battery - Fine (charged it up in another MacBook)
The thing that makes me feel the firmware is corrupted is the machine will not start up in open firmware mode at all, I've tried holding Command Option O+F but it just boots into Leopard as normal. I was hoping to get into O.F so I could run the reset-all command and see if that helped.

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