the solution to unlock hp530(power on password) is to rollbask to the F.07 bios version
-Download the F.07 bios bootable floppy version
-Create a usb bootable floppy diskette with the bios files
-Attach the usb floppy drive to the unit
-Hold the windows Key + B while turn on the unit
-You can see only caps lock light flashing and "NO" display
-The process will take 2 to 3 mins to complete.after that hp530 will reboot alone(don't shutdown your machine manualy)
Download the F.07