
Samsung Galaxy Note 10.1
The latest firmware for Samsung Galaxy Note 10.1 (SM-P602) is P602JVUCND4 with Android 4.4.2 (KitKat), released on November 18, 2014 for 1 region (CSC). Every official firmware build for SM-P602, newest first: one row per build with all regions (CSC) that received it.
Each firmware build has its own page at https://samfirm.shop/build/{PDA}, where {PDA} is the build number from the list above. Example: https://samfirm.shop/build/P602JVUCND4

SM-P605V

SM-P601

SM-P610X

SM-P907A

SM-P905V
You can find the firmware on the model: SM-P602 page.
Yes, all firmware files for SM-P602 are 100% official, original, and obtained directly from Samsung servers.
To flash SM-P602, you need to download the appropriate firmware, put your device into Download Mode, and use the Odin tool to load the BL, AP, CP, and CSC files.
Downgrading is only possible if the bootloader version (binary bit) of the old firmware matches the current one. Always check the binary version before flashing SM-P602.