You should put the card in a PC if you have one & find out what the device id actually is by running atiflash -i 0.
This is the device id I would start at.
As you are using a R430 card, I am not sure what is going to happen or if this is going to work, as X800 XT's are usually R420 & X850 XT's are R480 but this is software defined (this means that they in fact have the same chip & the software in the rom changes the chip details) as opposed to R430 which I suspect is hardware defined.
Still it may work, who knows? Make sure you back up the PC rom on a PC with atiflash first. It is also very possible that if this does not work the first time, you may have to replace the rom chip to get it recognised a second time.