How to convert se p900 to a pseudo-p910i equals p905? How?

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I need help. I bought my boyfriend a new sony high speed memory stick pro duo. however the problem is his pda phone is sony ericsson p900. mine is sony ericsson p910i. i didn't know that what i bought was not compatible for his phone. now i've searched the net and found out that there is still hope! that there is still a firmware i can install in the se p900 so that it will be able to suppport the memory stick pro duo. now, the question is, what softwares will i need? and where do i get it from? and how exactlyl do i convert the p990 to a p910i? what should i install? another thing, what exactly do they mean when they said, "i flashed my phone with this firmware"? is flash another slang word for the word install? i need help on this. thanks.