| 0x4 || 0x4 || Loaded from [[System_Settings|system-setting]] <code>contents_delivery!application_delivery_protocol_version</code>. Unused by [[#RequestSendSystemUpdate]]/[[#RequestReceiveSystemUpdate]], besides HMAC validation. | | 0x4 || 0x4 || Loaded from [[System_Settings|system-setting]] <code>contents_delivery!application_delivery_protocol_version</code>. Unused by [[#RequestSendSystemUpdate]]/[[#RequestReceiveSystemUpdate]], besides HMAC validation. |