This is your stock firmware:
Hotfile.com: One click file hosting: L710VPALEN_L710SPRALEN_SPR.zip
Download it and unzip it one time using 7Zip.
Which version of Odin are you using?
Put your phone into download mode. Pull the battery. Reinsert it. Press and hold Volume Up+Volume Down(press in the middle)+Power Button until it reboots.
Launch Odin by right clicking it and selecting Run as Administrator. Ensure that nothing Samsung related is running in the background of your PC. Check the Task Manager.
Select the PDA slot in Odin and target the firmware you unzipped earlier.
Plug your phone in to the PC using the factory supplied USB cable. Do not use hub. Odin should detect your phone. Your PC may install some drivers.
Press start in Odin.
Let the phone fully reboot. Perform a factory wipe.
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