help ..will not start

Bought truck with tuner allready installed one year ago.. Have no operating instructions. No problems till now. While in mountions on logging trail road tried to get power up I must have accidently cleared info.. Lost all power. 3hrs later following inst on screen I tried to get to manuf stock. Now screen tells me downloading is completed and I can restart truck and rest tuner or unplug. tried to start my truck, only runs for 3 seconds then shuts down.Unplugged tuner and replugged and it now says it is downloading SD. Then goes to menu for settings. I go to stock. Again truck runs for 3 sec then shts off. Truck is stranded in mtns for 2 days. Brought truck batteries home for full charge. Reinstalled batteries. Same problem. Help?

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