author: coldflame time: 2019-10-8 14:08
adb tools for VM780,
no special USB driver needed.
menu--->settings--->about, continous click on "software version", will enter engineering mode.
enable disk mode, enter passwd: 99999999, will prompt success, and the button turns green,
click dialup , enter *#666666#*
run cmd on windows PC, enter,
adb device
adb install -r xxx.apk
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