Reason: In some cases, when there are problems with the network consistency (or power) while the update is running, the device may enter a state where the update fails and the device is no longer usable.
Unfortunately, there is no way to manually fix this directly on the device via USB options or similar. As a solution, IGEL offers IGEL OS(RPI4) version 11.02.120which handles interruptions and inconsistencies in the network during updates.