I have a LX20 which produced the "invalid security code" after I opened
it to replace the very old watch battery. Filser uses a micro switch to
detect case opening, in this product.

Paul Remde at Cumulus Soaring promptly responded to my request for help,
and procured the program from Filser to reset the code. I did have to
ship the LX20 to Paul, where he quickly did the magic and sent it back
to me, for a very nominal fee.

Although I'd never done business with Paul before, he provided me with
first rate service, and helped me out when I really needed it.

Best regards,
Ken