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Hoang Thong Mobile
Since there was USB communication bug in v2.1.5 and v2.1.6 some DB2020 models dead after unsuccessfull unlock operation (GDFS was not fully written into the phone). You can repair these phones by starting the unlock procedure again with FBUS cable and do SimLock signing again even if the SW offers you to skip it. After this you have to connect the phone to the USB cable and continue with the second part of DB2020 unlocking. Please use the latest version. Currently v2.1.7.