Samsung Galaxy Ace Plus (GT-S7508) Firmware Overview
What is the latest GT-S7508 firmware?
S7508ZMLJ1, released October 8, 2012 with Android 2.3.6. The archive holds 3 official builds across 1 region (CSC). Each one is the full stock ROM (flash file) for Odin, not an OTA patch.
Is the Samsung Galaxy Ace Plus still getting updates?
Most likely not: there has been no new firmware since October 2012, so Android 2.3.6 is the last version this model got. The final builds below are still the best choice for a clean reinstall.
All GT-S7508 firmware builds
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. Use HOME_CSC to keep your data, CSC for a full wipe.