My XG105 firewall shows unable to start signature database

Question

Select option 1. Device Console . 
 In the console, execute the following command: show failure-reason 
 
 unable to start signature database 
 
 Please help me thanks

Sophos User2455 · Answer

i use device is reset with factory default But still can't recover

Hardik_R · Answer

Reset with following steps, if access is still not available after following below steps then contact support. 
 Version 17.5 
 In SFOS version 17.5, there is a new way to factory reset the device via the CLI. 
 
 Connect to the device using a serial console connection. Please see Sophos XG Firewall: How to setup a Serial connection with a console cable . 
 Once connected to the console, hard reboot the device. A password prompt will appear in the CLI. 
 In the password prompt, enter "RESET" (RESET should be entered in capital letters). 
 Select option 3 and enter "y". 
 The device will reboot to factory default settings. 
 
 Default IP address : 172.16.16.16 (Webadmin: https://172.16.16.16:4444) 
 Subnet Mask : 255.255.255.0 
 Default Username : admin and Password : admin.

Once the device is accessible, a backup can be restored. Please see Sophos XG Firewall: How to backup and restore a configuration .