[KBA-78938] HID EVO unit goes offline when not using Config Tool to upgrade or downgrade the firmware to 3.7.x
This article explains why the EVO unit remains offline after upgrading or downgrading to firmware versions 3.7.x, using a tool other than Config Tool.
After upgrading or downgrading an HID EVO controller to or from firmware 3.7.x, using the HID tool or Config Tool, your unit remains offline.
When an HID unit is upgraded to, or downgraded from firware versions 3.7.x, using a tool other than Config Tool, the unit's certificate on the Directory DB does not update with the new one. As a result, the unit remains offline.
If the unit is not controlling multiple doors, you can delete and re-enroll the unit.
This issue will be resolved in 5.7 SR3.
If you are running an earlier version of Security Center, contact GTAC to get a proper fix.