Instruction of flash W2 to new version
Open SP flashtool
Connect USB-android cable to your W2
Connect power cable to your W2
P.S.: Flash should be start when radio is POWER OFF, if radio power on, must unplug cable and USB data cable try again!!
Start flashing will see the Progress bar, till 100% that is success, now unplug data cable and power cable restart radio.
P.s. wrong installer package & often flash may cause damage to your Radio, please Cherish your radio with rational use.