Problem with OS PA50 help me please!!!

[sh09]

Hi,
I have a big problems with mo PA60.
After loading a style that was broken, the reboot I get the message "OS not present".
I downloaded the OS 1.03 of PA60 on the korg site, I run the executable to create my disk.
I place the reader in the PA60 I turn on by holding down the button "FADE IN / OUT".
I have the following message "insert disk and press enter", I press the function then appears the message Loading "BLOAD (a)", then I think the korg reboot, when PA60 appears on the screen then "BLOAD (e) ... Please wait ... "and nothing happens, either with the OS disk or Style!
I'd made a bad manip??
The PA60 is compatible with the 50 or 80?
Thank you for your help!
Chris