
Samsung Galaxy Ace 2
The latest firmware for Samsung Galaxy Ace 2 (GT-I8160P) is I8160PXXMG2 with Android 4.2.1 (Jelly Bean), released on August 21, 2013 for 8 regions (CSC). Every official firmware build for GT-I8160P, 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/I8160PXXMG2
GT-I8160P started on Android 2 and has received 1 major Android upgrade; it now runs Android 4.2.1 (Jelly Bean). The newest build, I8160PXXMG2, was released on August 21, 2013. No new build has appeared for 160 months, so regular updates for this model have most likely ended.
Box codes of GT-I8160P for different colors and markets. Firmware is chosen by the model code GT-I8160P and your region (CSC), not by the SKU.

GT-I9308

GT-I9268

GT-I9228

GT-I9210

GT-I9108

GT-I9103

GT-I9100T

GT-I9050
The newest firmware for GT-I8160P runs Android 4.2.1 (Jelly Bean): build I8160PXXMG2, released on August 21, 2013.
The latest build for GT-I8160P, I8160PXXMG2, was released on August 21, 2013 (13 years ago).
GT-I8160P has had no new firmware for 160 months, so regular updates have most likely ended.
Yes, all firmware files for GT-I8160P are 100% official, original, and obtained directly from Samsung servers.
To flash GT-I8160P, 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-I8160P.