[LG V20 Questions & Answers] tipsek:
Got my brand new LG V20 yesterday. It died today! Completely unresponsive, I tried all I could find, can anyone help, I’m willing to try it before sending in for warranty!

Device is LG V20 / H990DS made in Korea. It also says SEA on box so I assume that’s the SEA firmware.

I was hoping I could bring it back to life by flashing using this method https://xdaforums.com/v20/how-to/restore-v20-to-100-stock-bricked-devices-t3524903

BUT I get stuck right at the beginning – I can’t get into download mode! I can’t even turn the phone on, can’t get to recovery, nothing....

But, I did manage to get into fastboot once, maybe if I can get there again I can go to download mode from there? And once turned for a brief time on in detailed attempts later...

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How it happened:

I updated the phone to newest software. It updated around 3 times? Not sure of the versions wasn’t paying attention. All was OK. Then I left it overnight to charge. Woke up to 100%. All OK. Then I was connecting my Bluetooth smart band, and was having trouble. So I had to off/on Bluetooth a few times... Finally, my band connected. And then after a couple minutes, phone shuts down. I tried turning it on but only vibrated, nothing happened. I pulled the battery for 15 secs, tried again, I think it boot looped on LG logo. Then I started researching xda and internet and tried a lot of things, can’t remember all but long story short nothing worked really.

I do remember, putting it on charger while off at least 1 time, it started charging (battery at around 85-95% animation charging... Then not sure if it turned itself on or I tried and died.

At one point, when I tried to power it on it said something like “kernel crash” or something with a bunch of numbers, but I think it turned itself off (or I did after a few minutes not sure), don’t remember details.

Then I remember trying powering it on, also trying power + vol+ and power + vol- a few times pulling battery in-between nothing happened.

Then I tried connecting it to PC and got windows “chime” a.k.a. USB connected something a few times. But screen on phone was dead, and it displayed as “Lemobile Android Device” something like that, was not visible in My Computer (only under devices and printers).

And I remember trying to get the PC to recognize the phone, I tried to connect holding no buttons, tried with vol+, tried with vol- and sometimes I got the chime sometimes not.

And one of the final attempts, and probably the most progress I got before writing details below, I somehow got it into fastboot mode. I have no idea how, but it said fastboot on phone screen (with some other details) and it was connected to pc. I tried writing fastboot devices and it showed my phone as connected! So I thought OK, it seems phone is not totally dead. Then I wrote fastboot reboot-bootloader and it said success or whatever on PC, but phone didn’t react... After about 30 seconds or so, phone turned itself off (screen dead and fastboot devices didn’t see it anymore) and after this whatever I tried nothing worked. Since I don’t know how I got in fastboot mode anymore (I think I held some key and connected to pc, but can’t remember) I don’t know what else to try.

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After all of above, I decided I will write down all attempts exactly. So if you can help me, please, write exact steps what I should try, and let’s see what happens. I will edit post and add what I tried from suggestions.

Power Refresh =

1) pull battery out (and keep it out)

2) hold power key 1 min

3) put battery back in

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Attempt 1:

1) Power Refresh

2) hold power key 1 min – nothing

3) plug into charger 1 min – nothing

4) plug into pc 1 min (then disconnect) – nothing

5) hold power & vol+ 10s – nothing

6) hold power & vol- 10s – nothing

7) hold vol+ and plug into pc (30s) – nothing

8) hold vol- and plug into pc (30s) – nothing

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Attempt 2:

1) Power Refresh

2) hold vol+ and plug into pc (30s) – nothing

3) hold vol- and plug into pc (30s) – nothing

4) pull battery 10s and put back in

5) plug into pc 1 min (then disconnect) – nothing

6) pull battery 10s and put back in

7) hold power & vol+ 10s – nothing

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Attempt 3:

1) Power Refresh

2) plug into charger 10 min – nothing happened BUT, it’s warm between camera and power key

3) hold power key 1 min – nothing

4) plug into pc 1 min – nothing

5) hold power & vol+ 10s – nothing

6) hold power & vol- 10s – nothing

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Ready to give up and assume it’s DEAD BUT THEN......

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Attempt 4:

1) Power Refresh

2) Power key & vol+ - maybe a few seconds, phone vibrates, LG LOGO shows and it turns ON!!

3) I’m shocked, have no idea what to do now... Go into settings, check software version... Saw battery was at 85% or so....

4) Phone Reboots itself, LG Logo.... and DEAD. – but warm between camera and power key.

5) plug into pc 10s – nothing

6) pull battery (10s and put back in)

7) Power key & vol- 15s – nothing

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WTF at this point? It’s obviously NOT dead, but not alive either. Zombie mode?

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Attempt 5:

1) Power Refresh

2) Power key & vol- 15s – nothing

3) Pull battery (and put back in)

4) Power key & vol+ 15s – nothing

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Attempt 6:

1) Power Refresh

2) Do nothing 5 min

3) Power key & vol+ 30s – nothing

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Ready to give up again, HELP?

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Attempt 7:

1) Power Refresh

2) Go to sleep, trying more stuff in morning......

To be continued and updated once suggestions come in.....