Currently on firmware version XG310 (SFOS 17.5.16 MR-16-Build830. Want to upgrade to v18. Downloaded firmware from Sophos Licensing Portal: file: HW-18.0.6_MR-6.SF300-655 Followed the procedures and steps documented here: https://docs.sophos.com/nsg/sophos-firewall/18.5/Help/en-us/webhelp/onlinehelp/AdministratorHelp/BackupAndFirmware/Firmware/FirmwareLoadFirmwareSFLoader/index.html#load-firmware-using-sfloader_1 After uploading is complete through the sfloader I get the error: "FIRMWARE VALIDATION FAILED"
When I try through the gui, after uploading the firmware and clicking "Boot firmware image", the firmware loads but after restart the device starts with the old firmware again.
What could be the reason for this?
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