For a mobile technician, DFT Pro offers the best balance of speed and reliability for this specific device. However, for a casual user who only has one locked phone, the cost of the tool and the technical requirement of drivers/EDL cables makes it less viable than paying a local unlock service.
Have you successfully used DFT Pro on your Poco C40? Share your experience in the comments below—especially which key combination got you into Preloader mode. Poco C40 Frp Dft Pro