Please help! Can't flash recover after unbricking

Title says it all. I tried to update to mm and bricked phone. After following a few guides for two days I was able to get stock lollipop running. However I can't flash a recovery not through fastboot or twrp manager. On fastboot the computer says successful but it the phone doesn't respond, in twrp manager it says unsuccessful and it may already be installed yet I can't boot into any recovery

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