Thanks for prompt response, Olly.
I’ve contacted Gearbest, as advised, and described the case, attaching couple of photos. They get back to me pretty quickly presenting 3 alternative ways of resolving the issue. One of them was the swap of the faulty laptop for the new one under warranty (which I’ve accepted). I had to send it to Spain (covering the shippment cost, planning to get it back from PayPal under their policy) which is much faster and less burdensome than sending to China.
The parcel is already sent, I’m awaiting confirmation of its receipt by Gearbest, now.
EDIT (20.10.2018):
Gearbest offered me a refund of the price (but not the delivery cost), which I’ve accepted. Trying to get the delivery cost back from paypal under their new program.
Anyway, I’m now looking for a new laptop for a decent price. F6 Pro is tempting but I hear more and more stories of dead machines out there…