Install Android 2.3.4 Gingerbread On Samsung Galaxy Ace S5830

Requirements:

• S5830XXKPH – Android 2.3.4.
• Samsung USB drivers installed. Download USB drivers for 32 bit Windows | 64 bit Windows.

Instructions:

1. To begin, download the firmware from the link above and extract it.
2. Put your phone into download mode. {Download Mode : Home + Vol Dn + Power Button}
3. Run ODIN as found in the extracted folder and click on select OPS choosing Cooper_v1.0.ops.
4. Click on Boot and select the file starting with the name APBOOT.
5. Click on Phone and select the file starting with the name Modem.
6. Click on PDA and select the fileCODE_S5830XXKPH_CL260130_REV03_user_low_true.tar.md5.
7. Click on CSC and select the file starting with the name CSC.
8. That done, connect your phone to via the USB Cable and once ODIN shows the device is connected, hit the Start button.

Wait for the firmware to be flashed. Once done, the phone will reboot and you should boot into Android 2.3.4.

For updates and queries, visit the forum thread at XDA-Developers.