You can use these Repair Firmwares to Fix your Samsung Android Smartphone or Tablet, These files contain the full set of Samsung firmware files, Inside these packages you will get PDA, AP, Modem, Phone, CP, BL, Bootloader, and CSC file. In case you did not find the PIT file inside any full firmware package,
Then you can Download it from (PIT and OPS Files for Samsung Android Mobile Phones).
Make sure only Auto Reboot & F. Reset Time is ticked.
Put your device into download mode by pressing down Volume Down > Home > Power key
Press volume up on the screen that has a yellow triangle to get into odin mode.
Connect the device to the computer.
Added!! will be seen showing the device has connected successfully.
Click on BL an select bootloader file
Click on AP (new versions of odin) or PDA (older versions of odin).
Click on CP
Click on CSC
Wait for odin to process the Rom.
The flashing or upgrading process will now begin.
A green progress bar will be seen at the top left.
This process will take about 8 mins or more (depends on the size of the rom.
When you see PASS! at the top of odin GUI know that you have successfully flashed or upgraded the device
The device will reboot.
First boot after this process takes time. Be patient..
A310FXXU1AOLE / VFG1AOL2 v5.1.1
A310FXXU1APB7 / OXY1APB7 v5.1.1