hey guys, a friend has been experiencing some problems, he hadn't updated his blockchain wallet for a while. He downloaded new wallet, even deleted app folder, reinstalled, etc, let it sync, but when he replaces with old .dat, there appear to be transactions, but he doesn't have his old balance, just 31 coins out of thousands. How can he repairwallet, and what else can he do?
repairwallet should fix this
just go to help->debug window->console and type repairwallet