Can't open video files after firmware updated v2.21.126

Please check your My Cloud to see which firmware version you are running. You’ve posted the same question to two separate threads. Each thread deals with a DIFFERENT My Cloud firmware version. The two firmware’s ARE NOT the same. The V4.x firmware is for the OLDER first generation My Cloud units, the v2.x firmware is for the newer second generation My Cloud units. The newer units have different hardware hence the different firmware.