Line 1,885:
Line 1,885:
| 0x19 || 0x1 || Unknown. Unused by [[#RequestSendSystemUpdate]]/[[#RequestReceiveSystemUpdate]], besides HMAC validation.
| 0x19 || 0x1 || Unknown. Unused by [[#RequestSendSystemUpdate]]/[[#RequestReceiveSystemUpdate]], besides HMAC validation.
|-
|-
−
| 0x1A || 0x1 || Unknown.
+
| 0x1A || 0x1 || PlatformRegion (0x00 = Global, 0x01 = China).
|-
|-
| 0x1B || 0xC5 || Unused by [[#RequestSendSystemUpdate]]/[[#RequestReceiveSystemUpdate]], besides HMAC validation.
| 0x1B || 0xC5 || Unused by [[#RequestSendSystemUpdate]]/[[#RequestReceiveSystemUpdate]], besides HMAC validation.