How To Flash
For flashing this model of Samsung you need to use B320 Optiflash program and follow the next steps:
1- Run B320 Optiflash program.
2- Select the "Options" → "Settings" → "Generic" → "Specify hardware platform".
3- From the drop down list choose : Customer T: Kabura/Bauhaus(spansion 256/64, USB) as hardware type.
4- Check the option: Erase All Unused Regions ( Use With Caution ).
5- From COM Port Tab select Com port number and speed.
6- From Flash & Verify tab press on Browse button to select B320 flash file (B320xxxx.s3).
7- After that press OK.
8- Remove battery from the phone and put it back then press (*+Power) at the same time and connect USB cable to phone.
9- Press Flash button.
10- Type YES in the message box and press OK to start flashing.
11- The program will complete the process and when done it will show you "All is well"
12- Power on the phone and do full reset by this code *2767*3855#.
13- Wait till the operation done and the phone will restart by itself and will be ready to use.
Samsung B320 Original Firmwares.