Due to change of network card we need to uninstall and newly configured our Flash Operator Panel (FOP2).

We Purchased on may be 13/01/2016
After new installation when we tried to re-run the registration code its shows,

/usr/local/fop2/fop2_server --register
~Serial code already used on another hardware.
/usr/local/fop2/fop2_server --revoke
~Serial code not available for revokation on this machine!
/usr/local/fop2/fop2_server --test
~Flash Operator Panel 2 - Invalid license for this machine. Demo Mode

then we communicate with the admin of FOP2, they said
"You must request a manual revocation at support.asternic.biz , via email or via live help."