To upgrade your devices to IGEL OS 11, you need the appropriate version of the UMS. Also, the devices must be registered with the UMS to receive their licenses.
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If you have not already done so, update your UMS to version 6.01.130 or higher. For instructions, see Universal Management Suite > UMS Reference Manual > UMS Installation and Update > IGEL UMS Update.
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Make sure that your devices are registered with the UMS. For more information, see the chapter Universal Management Suite > UMS Reference Manual > Registering IGEL OS Devices on the UMS Server.
When the UMS is ready, continue with Adjusting the Setup Before the Buddy Update.