this flash frimware is crupted you must connect vcc(+5 volt ) to phison 12 st pin (top of u1 typed ) and plug to computer and show yo ps2250 after show drive in my computer you may breake the connection and run phison up19 and re framware it! I do it for 25 time and worked if you not undrstan i send you picture
davodamirajam@gmail.com