
Samsung GALAXY Tab 10.1
The latest firmware for Samsung GALAXY Tab 10.1 (SGH-T859) is T859UVLH6 with Ice(Android Cream), released on August 26, 2012 for 1 region (CSC). Every official firmware build for SGH-T859, 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/T859UVLH6

SGH-I927

SGH-S730M

SGH-T999N

SGH-T989D

SGH-T599V

SGH-I757M

SGH-I747

SGH-I717R
You can find the firmware on the model: SGH-T859 page.
Yes, all firmware files for SGH-T859 are 100% official, original, and obtained directly from Samsung servers.
To flash SGH-T859, 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 SGH-T859.