What is the ruling on selling a laptop to a wicked person, and is it permissible to sell it to a brother who works in a satellite dish shop, with his intention to use the device for non-prohibited programs? And is it permissible to open a mobile phone repair shop despite knowing about the widespread corruption? And does the repairer bear the sins of the users?

The basic principle is that it is permissible to sell computers, and this is only prohibited for someone who knows that it will be used for an unlawful purpose. There is no sin upon the seller if he does not know the buyer's intention, or if he predominantly believes the buyer's sincerity that he will not use it for unlawful purposes. Similarly, there is no sin in opening a shop for repairing devices and dealing with people, as long as one does not know that they will use them for unlawful purposes. The responsibility for using the device for unlawful purposes remains with its owner, not with the seller or the repairer, unless one intends to assist him in committing the wrongdoing.