Nevertheless, those who missed the OTA update notification for some reason and those residing outside the supported regions can still download and install the firmware manually, using this guide. Though the firmware is not yet available over Samsung KIES, it can be downloaded as an Over-The-Air (OTA) update through notifications from Samsung.
Samsung recently rolled out its latest official Jelly Bean firmware, Android 4.1.2 XXDMD1, for Galaxy Tab 2 10.1 GT-P5100 in several countries including Thailand, Indonesia, Malaysia and the Philippines.