Go to Settings -> About -> Software Information -> Build number. It may look something like 'WW-ASUS_Z00A-2.13.40.13...'. Therefore, you are running the WorldWide firmware SKU, version 2.13.40.13.
CN stands for China
TW stands for Taiwan
US stands for United States
TH stands for Thailand
IN stands for India
WW stands for WorldWide
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