We will use IOroot to root the LG G Flex F340. It is a multi platform rooting methode for many Lg models.
Download and extract the latest ioroot.zip… datroot.zip is inside the bts folder.
ioroot also jailbreaks other LG devices. Supported devices are found in the device list in this thread.
Enable “USB Debugging” on phone. Accept RSA certificate to allow ADB access. Not accepting RSA will cause ADB device to show as “offline”
Verizon users must also enable “Ethernet” for USB mode.
Double-click on ioroot.bat in ioroot folder.
Open terminal and cd into /ioroot/ folder
chmod +x ioroot.sh
double-click on ioroot.tool* in ioroot folder.
You should always make an EFS backup, in case you need it later.
dd if=/dev/block/platform/msm_sdcc.1/by-name/modemst1 of=/sdcard/modemst1.img
dd if=/dev/block/platform/msm_sdcc.1/by-name/modemst2 of=/sdcard/modemst2.img
dd if=/sdcard/modemst1.img of=/dev/block/platform/msm_sdcc.1/by-name/modemst1
dd if=/sdcard/modemst2.img of=/dev/block/platform/msm_sdcc.1/by-name/modemst2