
The latest firmware for GT-N5110 is N5110XXDNK4 with Android 4.4.2 (KitKat), released on November 17, 2014 for 2 regions (CSC). Every official firmware build for GT-N5110, 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/N5110XXDNK4
All 26 builds in our database run Android 4.4.2 (KitKat). The newest build, N5110XXDNK4, was released on November 17, 2014. No new build has appeared for 145 months, so regular updates for this model have most likely ended.

GT-N7000B

GT-N5105

GT-N8020

GT-N8013

GT-N8005
The newest firmware for GT-N5110 runs Android 4.4.2 (KitKat): build N5110XXDNK4, released on November 17, 2014.
The latest build for GT-N5110, N5110XXDNK4, was released on November 17, 2014 (11 years ago).
GT-N5110 has had no new firmware for 145 months, so regular updates have most likely ended.
Yes, all firmware files for GT-N5110 are 100% official, original, and obtained directly from Samsung servers.
To flash GT-N5110, 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-N5110.