Samsung Galaxy A11
The latest firmware for Samsung Galaxy A11 (SM-A115AZ) is A115AZTUSBCWL1 with Android 12, released on December 27, 2023 for 1 region (CSC). Every official firmware build for SM-A115AZ, 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/A115AZTUSBCWL1
SM-A115AZ started on Android 11 and has received 1 major Android upgrade; it now runs Android 12. The newest build, A115AZTUSBCWL1, was released on December 27, 2023. No new build has appeared for 34 months, so regular updates for this model have most likely ended.
Specifications of SM-A115, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-A115A

SM-A015A

SM-A127M

SM-A215U1

SM-A217N
The newest firmware for SM-A115AZ runs Android 12: build A115AZTUSBCWL1, released on December 27, 2023.
The latest build for SM-A115AZ, A115AZTUSBCWL1, was released on December 27, 2023 (2 years ago).
SM-A115AZ has had no new firmware for 34 months, so regular updates have most likely ended.
Yes, all firmware files for SM-A115AZ are 100% official, original, and obtained directly from Samsung servers.
To flash SM-A115AZ, 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-A115AZ.