The following CpFix utility will extend FPP operation on the following XTS2500, XTS4000 and XTS5000 UHF models:

XTS2500:
H46QDH9PW7AN (380-470 MHz, 4 MB)
H46QDH9PW7BN (380-470 MHz, 8 MB)
H46SDH9PW7AN (450-512 MHz, 4 MB)
H46SDH9PW7BN (450-512 MHz, 8 MB)

XTS4000:
H18QCN9PW9AN (380-470 MHz)

XTS5000:
H18QDH9PW7AN (380-470 MHz)
H18SDH9PW7AN (450-512 MHz)

After modification, the Q-split (380-470 MHz) XTS2500/4000/5000 FPP ranges are:

TX/RX:
380.00000 - 480.00000 MHz

After modification, the S-split (450-512 MHz) XTS2500/5000 FPP ranges are:

TX/RX:
438.00000 - 512.00000 MHz