5. The consumer shall cooperate with the trader, to the extent reasonably possible and necessary, to ascertain whether the cause of the lack of conformity of the digital content or digital service at the time specified in Article 11(2) or (3), as applicable, lay in the consumer's digital environment. The obligation to cooperate shall be limited to the technically available means which are least intrusive for the consumer. Where the consumer fails to cooperate, and where the trader informed the consumer of such requirement in a clear and comprehensible manner before the conclusion of the contract, the burden of proof with regard to whether the lack of conformity existed at the time specified in Article 11(2) or (3), as applicable, shall be on the consumer.