Changes

| 0x1A || 0x1 || PlatformRegion (0x00 = Unknown, 0x01 = Global, 0x02 = China).

| 0x1A || 0x1 || PlatformRegion (0x00 = Unknown, 0x01 = Global, 0x02 = China).

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| 0x1B || 0xC5 || Unused by [[#RequestSendSystemUpdate]]/[[#RequestReceiveSystemUpdate]], besides HMAC validation.

| 0x1B || 0x1 || [20.0.0+] SystemDeliveryInfoPlatform. Loaded from [[System_Settings|system-setting]] <code>ns.systemupdate!system_delivery_info_platform</code>. Elsewhere this is compared against the sys-setting, etc.

| 0x1C || 0xC4 || Unused by [[#RequestSendSystemUpdate]]/[[#RequestReceiveSystemUpdate]], besides HMAC validation.

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| 0xE0 || 0x20 || HMAC-SHA256 over the previous 0xE0-bytes.

| 0xE0 || 0x20 || HMAC-SHA256 over the previous 0xE0-bytes.