
Samsung Galaxy Tab 2 7.0 (Chinese)
The latest firmware for Samsung Galaxy Tab 2 7.0 (Chinese) (GT-P3108) is P3108ZMDMC4 with Jelly(Android Bean), released on March 28, 2013 for 1 region (CSC). Every official firmware build for GT-P3108, 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/P3108ZMDMC4

GT-P6810

GT-P6211

GT-P6200

GT-P1000N

GT-P7320T
You can find the firmware on the model: GT-P3108 page.
Yes, all firmware files for GT-P3108 are 100% official, original, and obtained directly from Samsung servers.
To flash GT-P3108, 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 GT-P3108.