: Go to Settings > About tablet > Build number . Look for the first two letters (e.g., WW for International, US for America, TW for Taiwan).

Since the official system is now very old, many users install custom ROMs to access newer apps. :

ended at Android 4.2.1 Jelly Bean. You must ensure you download the version matching your device's (region code).

: Do not flash a firmware with a different SKU (e.g., installing a TW version on a WW tablet), as this can cause permanent failure.

: To install these, you must first unlock the bootloader and install a custom recovery like TWRP .

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