Im done uploading the firmware or stock rom for S5303 or the Samsung Galaxy Y Plus. I hope this firmware helps you.
You need to download several files including the firmware
Odin --> Odin 3.07
Firmware -- > S5303
Firmware --> Part 2
Firmware --> Part 3
Firmware --> Part 4
Samsung Driver -- > SamsungDriver
"Extract these files in your desired folder"
"Use Winrar to JOIN all parts of the files"
Installing the driver
1. Install driver first just keep on hitting next.
2. After installing the driver Press and Hold Volume Down + Home Key + Power Button, a selection will appear if you would like to go in Download Mode, Press Volume Up to proceed in Download Mode.
3. Connect your phone in the PC via USB Cable
4. Wait for it to finish installing the driver.
"Note: Sometimes it is better to reboot your PC. After installing the driver."
BEFORE PROCEEDING IN FLASHING MAKE SURE THAT THE BATTERY IS FULLY CHARGED OR 50% CHARGED.
Flashing your Phone
1. Open Odin 3.07
2. Load only PDA, because the file is one package. Ignore loading csc and phone in the picture it is just an example.
PDA --> S5303DDAMD1_S5303ODDAMD1_S5303DDAMD1_HOME.tar
3. Do not check repartition in option key, copy only what is shown in the picture above.
4. When you are ready to flash your phone, Press and Hold Volume Down + Home Key + Power Button, a selection will appear if you would like to go in Download Mode, Press Volume Up to proceed in Download Mode.
5. Connect your phone in the PC via USB Cable, wait for a value in the ID:COM to appear. It will turn yellow with number example: COM32, if it nothing appear close Odin an open it again and load the file again.
6. Press START to proceed flashing your phone. Wait until it is done, the phone will reboot after flashing.
I hope this tutorial help you. Drop a comment if there is something is not clear to you. Cheers! ^_^