IOroot25r1 Download: http://bit.ly/1ldPel3
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Automated root for LG Optimus G, G Pro, G2, G Pro 2, G Flex, G3
Original IOroot 1 - 10 by IOMonster (thecubed on XDA)
http://tinyw.in/mXhw
Original LG root backdoor by giantpune
Original linux script and IOroot 11 by Shelnutt2
IOroot 12 - 25r1 and 4.4.2+ root by autoprime
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Changelog:
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v25r1: Fixed LG OG EFS backup. Added D802T 4.2.2 support. Script checks for 4.4.2 first. G3 supported.
v25: Added root for 4.4.2 devices. Added G Pro 2 D838 support.
v24: added support for G2 D800 10q, G Flex D956 and G Pro 2 F350K/L/S
v23: added support for AT&T G Flex D950 10c.
v22: added support for TMO D959 G Flex. Tweaked scripts EFS backup... hopefully no more errors.
v21: added support for Sprint LS980ZVA update. Added EFS backup support. 
v20: added support for all D802/D805/D806. Updated all scripts. Added LG Optimus G and LG G Flex support.
v19: added support for MORE F320 4.4 firmware. Added Singtel D802 support. Linux/Mac script fixes.
v18: added support for MORE F320 4.4 firmware. Added Vodafone(VDF) carrier(should work with at least Shipping ROM). Tweaked scripts.
v17: added F320* 4.4 KitKat root. Added SuperSu.4.4 users must reboot after running root script(mac/linux)
v16: added TMO 10g root and "SCA" root(D802/D805)
v15: added ATT 10o root. 
v12: added Verizon 12B root.
v11: added Sprint LS980 root. 


Supports(as of Jun 07 2014):
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LG G3
F400 Series - Shipping ROM

LG G2:
D800 - D80010d/D80010o/4.4.2
D801 - TMO(all 4.2.2 // No 4.4.2 support), CLR(all 4.2.2 // 4.4.2 ??), WND(all 4.2.2 // 4.4.2 ??), VTR(all 4.2.2 // 4.4.2 ??)
D802 - all
D803 - all
D805 - all
D806 - all
F320K (Shipping ROM)
F320K - F320K20a/20f // 4.4.2 ??
F320L (Shipping ROM)
F320L - F320L20b/20e // 4.4.2 ??
F320S (Shipping ROM)
F320S - F320S20a/20g // 4.4.2 ??
Sprint LS980 - All
Verizon VS980 - All

LG G Flex:
F340 series - All 4.2.2  // 4.4.2 ??
D950 - All 4.2.2 // No 4.4.2 support
D955 series - All 4.2.2 
D958 series - All 4.2.2 // No 4.4.2 support
D959 - All 4.2.2 // No 4.4.2 support
LS995 - All

LG Optimus G - All

LG G Pro: 
4.4.2 Only

LG G Pro 2:
F350 series - Shipping ROM // 4.4.2 ??
D838 - Shipping ROM // 4.4.2 ??

LG G Pad - 4.4.2 only
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Directions:
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Confirm your device is supported above.

Download latest IOroot zip and extract it. 

Set phone in USB Debugging mode. 
 
Verizon users need to set USB connection to "Ethernet" mode. 

Confirm device is detected in ADB using "adb devices" command. 
Be sure to accept the RSA prompt on your phone.. and check the "always allow" box as well. 

Run .sh/.bat and follow the onscreen instructions. 

If the script is stuck at "waiting for device".. turn your phone screen on and unlock it.. make sure ADB has the proper permission and that the ADB RSA prompt isn't sitting on the YES/NO screen. Check the "always remember" box when you accept it!!!

Windows: 
Download and install proper ADB driver. Double-click on root.bat

Linux: 
cd into IOroot folder 
chmod +x root.sh
./root.sh

Mac: 
cd into /IOroot/mac folder
chmod +x root.sh
./root.sh


Drivers:
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Verizon Drivers - http://bit.ly/1bXdAdf
Drivers for everyone else - http://bit.ly/18EPHZN


Manual 4.4.2 Root:
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cd into ioroot folder (ioroot/mac/ if on OSX...)
Linux/Mac users may have to enter ./ before adb on each line. 
Example: ./adb push g2_security /sdcard/g2_security

1. adb devices 
2. adb reboot recovery
(when booted in recovery, select: 'apply update from adb' with power button)
3. adb sideload kk_root.zip

reboot when zip finishes flashing. done.




4.2.2 Manual Root:
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Download and extract the latest IOroot.zip
Enable USB Debugging. VZW users must also enable ethernet mode. 
Open terminal/command prompt. windows/linux users: cd into /ioroot folder. mac users cd into /ioroot/mac
(windows users can hold shift key, right click in ioroot folder. Select "open command window" option.

copy/paste commands below.. hitting enter/return after each line. 
Linux/Mac users may have to enter ./ before adb on each line. 
Example: ./adb push g2_security /sdcard/g2_security

1: adb devices
(make sure it sees your device; if "offline" turn on phone/unlock and accept RSA key prompt)
2: Choose next line based on model and firmware version:
AT&T D80010d (Shipping ROM): adb push g2_security /sdcard/g2_security
AT&T D80010o/10q: adb push ytiruces_1a_att /sdcard/ytiruces_1a
KT F320k (Shipping ROM): adb push g2_security /sdcard/g2_security
KT F320K20a/20f (KitKat): adb push ytiruces_1a_kk /mnt/shell/emulated/0/ytiruces_1a
LGU F320L (Shipping ROM): adb push g2_security /sdcard/g2_security
LGU F320L20b/20e (KitKat): adb push ytiruces_1a_kk /mnt/shell/emulated/0/ytiruces_1a
D802(T) (4.2.2): adb push g2_security /sdcard/g2_security
D803 (4.2.2): adb push ytiruces_1a_d803 /sdcard/ytiruces_1a
D805 (4.2.2): adb push g2_security /sdcard/g2_security
D806 (4.2.2): adb push g2_security /sdcard/g2_security
SKT F320S (Shipping ROM): adb push g2_security /sdcard/g2_security
SKT F320S20a/20g (KitKat): adb push ytiruces_1a_kk /mnt/shell/emulated/0/ytiruces_1a
Sprint LS980ZV7/ZV8: adb push g2_security_spr /sdcard/g2_security
Sprint LS980ZVA (OTA): adb push ytiruces_1a_ls980 /sdcard/ytiruces_1a
T-Mobile D80110c (Shipping ROM): adb push g2_security /sdcard/g2_security
T-Mobile D80110g (OTA): adb push ytiruces_1a_tmo /sdcard/ytiruces_1a
Verizon VS98010B (Shipping ROM): adb push g2_security_vzw /sdcard/g2_security
Verizon VS98011A/12B (OTA): adb push ytiruces_1a_vzw /sdcard/ytiruces_1a
Videotron D801 (4.2.2): adb push ytiruces_1a_d803 /sdcard/ytiruces_1a
Wind D801 (4.2.2): adb push ytiruces_1a_d803 /sdcard/ytiruces_1a

F340-Series (4.2.2): adb push ytiruces_1a_F340JB /sdcard/ytiruces_1a
D950 (4.2.2): adb push ytiruces_1a_kk /sdcard/ytiruces_1a
D955-Series (4.2.2): adb push ytiruces_1a_kk /sdcard/ytiruces_1a
D956-Series (4.2.2): adb push ytiruces_1a_kk /sdcard/ytiruces_1a
D958-Series (4.2.2): adb push ytiruces_1a_kk /sdcard/ytiruces_1a
D959 (4.2.2): adb push ytiruces_sumtz /sdcard/ytiruces_sumtz
LS995 (4.2.2): adb push ytiruces_1a_ls995 /sdcard/ytiruces_1a

F350K/L/S (4.4.2): adb push ytiruces_1a_kk /sdcard/ytiruces_1a

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This next depends on your computer/phone model...

USB Connection Mode needs to be toggled.
Ways to do this are listed below...

a. Unplug usb cable from phone then re-plug.
b. Toggle USB mode from Charge to MTP back to Charge
c. Toggle USB mode from Ethernet to MTP back to Ethernet (VZW users)
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3: adb shell
(you should now see a # instead of a $. # = root)
4: exit
5: adb shell "mount -o remount,rw /system"
6: adb push su /system/xbin/su
7: adb push su /system/xbin/daemonsu
8: adb push install-recovery.sh /system/etc/install-recovery.sh
9: adb shell "chown 0.0 /system/xbin/su;chmod 06755 /system/xbin/su"
10: adb shell "chown 0.0 /system/xbin/daemonsu;chmod 06755 /system/xbin/daemonsu"
11: adb shell "chown 0.2000 /system/etc/install-recovery.sh;chmod 755 /system/etc/install-recovery.sh"
12: adb shell "sync;mount -o remount,ro /system"
13: adb install Superuser.apk

REBOOT AFTER STEP #13