Your photo is similar to my MXv3, but a little different. Mine has a row of 5 buttons across the top:
Bell-TV-Power-DVD-AUX
From the photo, it looks like you have the "Nova" remote, which preceded the MXv3. Reset instructions for the Nova are here, but it sounds like you already tried that, without success.
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support.bell.ca/Fibe_TV/ ··· _tv_novaPerhaps you could get a Bell store to swap your malfunctioning remote for an MXv3, or even the latest "slim" remote. The latter is pretty slick, but it only controls the Fibe receiver and a limited selection of TVs (volume and power). It can't be programmed to drive a DVD or AUX devices.