
The latest firmware for GT-P5110 is P5110XXDNH2 with Jelly(Android Bean), released on September 29, 2014 for 4 regions (CSC). Every official firmware build for GT-P5110, 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/P5110XXDNH2
All 17 builds in our database run Android 4.2.2 (Jelly Bean). The newest build, P5110XXDNH2, was released on September 29, 2014. No new build has appeared for 147 months, so regular updates for this model have most likely ended.
Box codes of GT-P5110 for different colors and markets. Firmware is chosen by the model code GT-P5110 and your region (CSC), not by the SKU.

GT-P6810

GT-P6211

GT-P6200

GT-P1000N

GT-P7320T
The newest firmware for GT-P5110 runs Android 4.2.2 (Jelly Bean): build P5110XXDNH2, released on September 29, 2014.
The latest build for GT-P5110, P5110XXDNH2, was released on September 29, 2014 (12 years ago).
GT-P5110 has had no new firmware for 147 months, so regular updates have most likely ended.
Yes, all firmware files for GT-P5110 are 100% official, original, and obtained directly from Samsung servers.
To flash GT-P5110, 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-P5110.