Korg Poly800/EX800 Users

Hello everybody. I have ridden a message 'bout adding to Poly800 
possibility of sysex files transfer.I understood that it's necesearly 
to replace POLY800's ROM chip to EX800 chip.I'm afraid to do it,'cous 
I like my instrument...etc. Maybe are any way to do anythig with tape 
signal input & output,to transform tape signal to sysex? Many thanx 
for any help!!! Alexandro.