This firmware is signed with a Private/Public key pair. The MTR product MUST contain version 5.1.3 or newer before upgrading to version 6.0.0. The firmware version 6.0.0 is intended for all MTR-LEU7/LNA7/MNG2/L4G1 models. See Release Notes for further details, full release notes and upgrade procedure information. If firmware upgrade indicates it failed, then DO NOT power cycle, power off or reboot! Try the firmware upgrade again. If it fails again, then keep trying or possibly retry with an older version, but DO NOT power cycle, power off or reboot!