Hello! I'm sorry to hear that your remote for the TV stick is not working. If you plan to buy a new remote through the Blue app, please make sure that it is compatible with your Xiaomi TV stick model. You can also check if there are authorized Xiaomi stores or service centers in your area where you can purchase a replacement remote for your TV stick.
If you have any specific questions about the compatibility of the remote or need assistance in finding a store, feel free to ask!