Download the apk file from http://towelroot.com/
And install ROOT app. Open the app and it will root your phone.
Then update the supersu binary.see
For the file you need to use to update supersu.
Download rootcheaker app grom the google play to verify your phone it’s rooted.
How to enter LG L70 MS323 recovery mode? How to put your LG Optimus L70 into recovery mode?
[Update] The LG L70 on metroPCS has a locked boot loader, So you can not boot the ms323 into recovery mode with the ADB tool.
What is needed:
Step 1- You need to enable USB debugging mode:
Go Settings – General – Developer options – USB debugging.
If you don’t see it: Settings – General – About phone – Common – Software info – click 5-10 times on Build number.
Spte 2- Connect your phone to computer.
Step 4- Navigate to android-sdk-windows\platform-tools directory (The directory where you unpacked the Android SDK Tool) and open Command Prompt (Shift + Right-click anywhere in the folder > Open Command Prompt.
In the command prompt window, Type in the following command and press Enter.
You should see the “List of devices attached”, if your handset is connected to PC successful.
Now, You are ready to boot your LG L70 MS323 into recovery mode,
Type in the following command and press Enter.
adb reboot recovery
Step 5 – Your LG L70 MS323 will turn OFF and then boot into the Recovery Mode. Navigate up and down using the volume keys.