Here's a link to HTC's instructions for a hard reset. It gives two sets of instructions, one using the volume key (which won't work for you since yours are not functioning properly), and the other using the on screen Settings option. Resetting HTCFirst Hard reset
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Here's a link to HTC's instructions for a hard reset. It gives two sets of instructions, one using the volume key (which won't work for you since yours are not functioning properly), and the other using the on screen Settings option. Resetting HTCFirst Hard reset