Overview
You can upgrade the system in your Kerio Control NG box with a USB flash drive.
The update tool is designed for a single-use. An operation does not repeat if you restart with the flash drive still in the USB port. Once you perform the operation unplug the flash drive.
All data and settings remain preserved after the upgrade.
There are two types of USB flash drives on the market. Kerio Control NG500 requires a flash drive formatted with a master boot record (MBR). USB drives with floppy-type formatting cannot connect to Kerio Control NG500 but can be reconfigured to work.
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How to convert a USB disk to MBR?
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Solution
- Insert the flash drive into a USB port on your computer. The flash drive should have at least 256 MB storage.
- Make sure that only one partition with the FAT32 (VFAT) file system is created on the flash drive. The USB disk must not be formatted by the NTFS, ext2, ext3, or ext4 file systems.
Note: When you execute
lsblkcommand and if you have "sdb1" under "sdb" it won't work. sdb should be formatted as FAT32 without any partition inside. - Download and save the kerio-control-usbupgrade file to the flash drive.
Note: to download the older version, please visit the Kerio Software archive. - Switch off the Kerio Control box.
- Plug the USB flash drive into a USB port of your Kerio Control box.
- Switch on the Kerio Control box. Then the upgrade starts.
Note: Kerio Control tries to boot from USB first and then goes for the disk drive. When you put a non-bootable USB, it sometimes fails to boot and gets stuck at a black screen or asks you to press Enter to continue. So in order to boot from the disk drive, you need to change the boot order from the device BIOS through the serial console. This way, the box boots from the disk drive and then looks for the image in the USB.
- When the upgrade is complete, the Kerio Control box reboots to the new version.
- Remove the flash drive from the Kerio Control box.
Testing
Kerio Control is upgraded to the desired version.