Thales Communications said it has introduced firmware designed to upgrade early versions of its Project 25-compliant radios. Version 5.11, for Model 501 radios, includes priority scan improvement, enhanced keypad with side button lockouts, unit identification display and backlight enhancements. Version 7.1, for Models 503 through 506, increases sensitivity while scanning, improves receiver response time and provides more reliable shadow channel selection, the company said. The firmware can be obtained free of charge at www.thalescomminc.com.