Failsafe mode after firmware update from 20.0.2 to 21.0.0

Question

Hello community, 
 we just performed the firmware update from 20.0.2 to 21.0.0 on all firewalls. All firewalls except one completed the update with no issues. One firewall went into failsafe mode after the update. Failsafe reason is "Unable to start Config Database". The affected firewall is in a HA (active/passive) configuration. Since there is not really any documentation on the failsafe mode, does anyone know how to fix this? 
 A case with support has already been created. The case ID is 02168680 .

Jens · Accepted Answer

If anyone else is facing this issue we received the following resolution from support. 
 1. Reboot the affected device. 
 If the reboot doesn't resolve the issue: 
 2. Factory reset the affected device. 
 3. Restore a backup. 
 If the backup doesn't resolve the issue: 
 4. Support needs to collect a log bundle and if possible the faulty backup for analysis.

Failsafe mode after firmware update from 20.0.2 to 21.0.0

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