Korg Poly800/EX800 Users

Hi!
I have plugged my ex800 into the computer and it has lost its patch 
data :( ... I would like to know how I go about loading patch data 
thru sys ex (eg. the original patch datum)... I am sort of a clod 
when it comes to computers and midi.. if anybody can tell me how to 
send the patch date thru sys ex it would be greatly appreciated! (or 
do I have to load the patched thru the tape entry)
best regards,
Geronimo