Just received a e-mail from Whistler Support this is a copy and past from that e-mail.
Radio Shack supports all of their models and provides any firmware updates so you should contact them for any questions about the PRO-668.
Thank you,
The Whistler Group, Inc.
Customer Service/Warranty Manager
Mailing: PO Box 1760 | Bentonville, AR 72712
Physical: 1716 SW Commerce Dr | Bentonville, AR 72712
Radio Shack supports all of their models and provides any firmware updates so you should contact them for any questions about the PRO-668.
Thank you,
The Whistler Group, Inc.
Customer Service/Warranty Manager
Mailing: PO Box 1760 | Bentonville, AR 72712
Physical: 1716 SW Commerce Dr | Bentonville, AR 72712