If your device is defective, you should first consider repairing it. The SuperDrecksKëscht action has set up the "Flécken a Léinen" site, which highlights the possibilities open to Luxembourg to repair a whole range of products including electrical and electronic equipment. This site also allows you to borrow products that are only needed one time. More information on http://www.flecken-a-leinen.lu/
Other initiatives are also present in Luxembourg, including the famous Repair Cafés. The initiative has its own page at: https://www.repaircafe.lu/
The donation of devices is also a laudable solution. Under "My device is reusable, what can I do? " is a series of actions undertaken in this direction on the territory of Luxembourg, which also have the quality to position themselves in the social and solidarity economy.