HTC M9 5.1 update aborted, need help!

Hi guys, im trying to update from 5.0.2 to 5.1. After downloading, I choose to install and it gets about 25% done, than it gets aborted. Error code 7 and someone about bootloader unlock yes/no. My phone is stock and id like to keep it that way, please help! [emoji29] [emoji29] <br />
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