Samsung Galaxy Ace Plus (GT-S7508) Firmware Overview
The archive lists 3 official builds for the Samsung Galaxy Ace Plus across 1 region (CSC). The newest one is S7508ZMLJ1, released October 8, 2012 with Android 2.3.6.
How to Flash GT-S7508 Firmware
Put the Samsung Galaxy Ace Plus into Download Mode, load the BL, AP, CP and CSC files into Odin on a Windows PC and press Start. Pick a build with the same or a higher Bit than the one installed — a lower bootloader binary will be rejected.