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adb shell mount /system
abd shell

echo "persist.service.adb.enable=1" >> default.prop 
echo "persist.service.debuggable=1" >> default.prop
echo "persist.sys.usb.config=mtp,adb" >> default.prop
echo "persist.service.adb.enable=1" >> /system/build.prop 
echo "persist.service.debuggable=1" >> /system/build.prop
echo "persist.sys.usb.config=mtp,adb" >> /system/build.prop

cd ~/.android
adb push adbkey.pub /data/misc/adb/adb_keys