Not sure why he's giving you links to these remotes, as this system is clearly AFTERMARKET and is not an OEM BMW setup. You should find out what company made it (or see if a local shop uses the same setup) and find a replacement remote, or ask what's wrong with it.

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2012 BMW X5 xDrive35d
Alpine White | Sand Beige Nappa w/ Leather Dashboard | Light Poplar | Premium Pkg | Sport Pkg | Premium Audio Pkg | Tech Pkg w/ HUD | Multi-Contour Seats | Heated Seats | 20" Wheels | Soft-close Doors | Running Boards | Spare