LG G4 H818N - Security Error - GSM-Forum

evilgabbie · 12-15-2016, 02:54

Have a LG G4 H818P
Phone was having a memory leak so we performed a Master Reset device. Then via recovery.

Phone boots up and gets stuck at the LG Logo

Security Error
Authentication Failed: 9

Tried downgrading to 10b and reupgrading to 20h, no luck.

Any suggestions ? Phone was not rooted prior.

andrew_tm · 01-23-2017, 09:39

1. Try make security reset.
2. Reflash phone with checked:
- flash in direct mode
- erase user data after flash

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evilgabbie · 01-25-2017, 06:57

Just tried that, now in a bootloop.

andrew_tm · 01-26-2017, 20:41

Try reflash boot using emmc, if not help check hardware.

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12-15-2016, 02:54	#1 (permalink)
evilgabbie Freak Poster Join Date: Sep 2004 Location: Toronto Age: 41 Posts: 229 Member: 84323 Status: Offline Thanks Meter: 15	LG G4 H818N - Security Error Have a LG G4 H818P Phone was having a memory leak so we performed a Master Reset device. Then via recovery. Phone boots up and gets stuck at the LG Logo Security Error Authentication Failed: 9 Tried downgrading to 10b and reupgrading to 20h, no luck. Any suggestions ? Phone was not rooted prior.

01-23-2017, 09:39	#2 (permalink)
andrew_tm Product Supporter Join Date: Feb 2007 Location: Europe Posts: 8,010 Member: 445973 Status: Offline Thanks Meter: 3,489	1. Try make security reset. 2. Reflash phone with checked: - flash in direct mode - erase user data after flash --

01-25-2017, 06:57	#3 (permalink)
evilgabbie Freak Poster Join Date: Sep 2004 Location: Toronto Age: 41 Posts: 229 Member: 84323 Status: Offline Thanks Meter: 15	Just tried that, now in a bootloop.

01-26-2017, 20:41	#4 (permalink)
andrew_tm Product Supporter Join Date: Feb 2007 Location: Europe Posts: 8,010 Member: 445973 Status: Offline Thanks Meter: 3,489	Try reflash boot using emmc, if not help check hardware. --