I'm not sure what the case law on this is, but if you form a contact to supply X and the X you supply is broken, it's not unreasonable for you to demand a worki

I'm not sure what the case law on this is, but if you form a contact to supply X and the X you supply is broken, it's not unreasonable for you to demand a working X is provided as per the contract (specific performance). Also, bricking someone's device remotely* and giving them only the option of a refund is dangerously close to criminal damage of their property. * Although in this case it sounds like they blocked it on their side rather than remotely killing the device.