An Adaptation kit upgrade (AKU or Adaptation kit update) updates Microsoft's Windows Mobile operating systems for devices (excluding Windows 10 Mobile). It is a collection of updates, fixes and enhancements to the tools delivered to hardware device manufacturers to create or update devices based on a specific platform. Microsoft releases AKUs to allow device manufacturers with updates to create new products or fix issues with older products. These enhancements are usually not available to the consumer or end user unless released as a firmware update from the vendor.