[G4 General] dushyantmani:
1. FLASH THE ATTACHED KDZ FILE with LG FLASH TOOL ONLY.

Note :- If phone gets black screen or no response in any process after rooting or installing h9,do not remove battery or unplug USB cable wait for minutes.Remove battery and reinsert after few minuites.

2. ROOT YOUR DEVICE.

Download and copy the prerooted system on your device internal storage.before,Extract it by download and install this tool in your computer.(link:-http://www.powerarchiver.com/)

Note:-extracted file should be in .img format.

Download LG root.zip from (link:-https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwirqpyMpKDTAhXGvY8KHYehCAQQFggtMAE&url=https%3A%2F%2Fdocs.google.com%2Fuc%3Fauthuser%3D0%26id%3D0B0hcxOtcOlhLWDZPZFRybmdDZWc%26export%3Ddownload&usg=AFQjCNEdq5TweT0Q_cvF2-i3Z1JC2LrzTA&bvm=bv.152180690,d.c2I )

HOW to ROOT:- (link:- http://www.androidexplained.com/inte...4-how-to-root/ )

Note :- wait for # type command "LEAVE" to leave or exit.

AFTER ROOTED

3.RESTORE SIGNAL:Download backupimg.zip, extract it then copy the folder backupimg on your device internal storage, DON'T RENAME. Install SSHDROID and busybox from play store on your phone and and download PUTTY application and install it on your pc. Try this link. http://www.chiark.greenend.org.uk/~s.../download.html

Run the sshdroid (you need wifi connection). Run putty on your pc, click on ssh and connect your phone by typing the address shown on sshdroid app and then click load.

(for pictures read the thread :- https://xdaforums.com/g4/general/lg-g4-f500l-restore-signal-flash-815-t3214574/page14)

type "admin" on putty black window (It may be invisible while typing)

(for pictures read the thread :- https://xdaforums.com/g4/general/lg-g4-f500l-restore-signal-flash-815-t3214574/page14)

then copy and paste the following commands one by one .

cd /storage/emulated/0/backupimg/

dd if=aboot.img of=/dev/block/mmcblk0p8

dd if=abootbak.img of=/dev/block/mmcblk0p14

dd if=boot.img of=/dev/block/mmcblk0p38

dd if=factory.img of=/dev/block/mmcblk0p43

dd if=hyp.img of=/dev/block/mmcblk0p6

dd if=hypbak.img of=/dev/block/mmcblk0p12

dd if=laf.img of=/dev/block/mmcblk0p37

dd if=modem.img of=/dev/block/mmcblk0p1

dd if=persist.img of=/dev/block/mmcblk0p23

dd if=pmic.img of=/dev/block/mmcblk0p2

dd if=pmicbak.img of=/dev/block/mmcblk0p10

dd if=raw_resources.img of=/dev/block/mmcblk0p45

dd if=raw_resourcesbak.img of=/dev/block/mmcblk0p46

dd if=rct.img of=/dev/block/mmcblk0p34

dd if=recovery.img of=/dev/block/mmcblk0p39

dd if=rpm.img of=/dev/block/mmcblk0p7

dd if=rpmbak.img of=/dev/block/mmcblk0p13

dd if=sbl1.img of=/dev/block/mmcblk0p3

dd if=sbl1bak.img of=/dev/block/mmcblk0p9

dd if=sdi.img of=/dev/block/mmcblk0p5

dd if=sdibak.img of=/dev/block/mmcblk0p15

dd if=sec.img of=/dev/block/mmcblk0p31

dd if=tz.img of=/dev/block/mmcblk0p4

dd if=tzbak.img of=/dev/block/mmcblk0p11

exit

Then disconnect and reboot your phone twice .

Notes:-

Do note do factory reset because in my phone camera is hanging after reset .

---------- Post added at 02:22 PM ---------- Previous post was at 02:21 PM ----------

This is complete process which I edited.

yes just root it and follow next step to restore signals.

---------- Post added at 02:29 PM ---------- Previous post was at 02:22 PM ----------

this is the link to download lg root.zip folder

https://docs.google.com/uc?authuser=0&id=0B0hcxOtcOlhLWDZPZFRybmdDZWc&export=download