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How to downgrade LG G4 (not beat) model number H815P to Lollipop

in LG G4 H815
by (Contributor) (14.5k points)
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Hi

I want to downgrade my LG G4 model number H815P back to lollipop, because my battery life was far better, please help me to downgrade my phone and find the stock software/ROM. Please any help would be much appreciated!
Thanks!

1 Answer

by (Genius) (10.4m points)
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Best answer

Hi. There is a tutorial here intended for the same purpose. Let us know should you have any further needed assistance hereon.

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by (Contributor) (14.5k points)
Hi

I saw that page, but that was for model number H815 not H815P, will it also work?
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by (Genius) (10.4m points)
edited by
Hi. Sorry I did not see your comment in time. Yes that will work. The 'P' extension serves for language packs. Most versions have English but may not have languages like Afrikaans, Zulu, Sotho etc if not intended for the regions surrounding SA like the H815P
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by (Contributor) (14.5k points)
Hi

Thanks! I will do it and let you know

Have a nice day
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by (Genius) (10.4m points)
Well and all the best!
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by (Contributor) (14.5k points)
Hi

I tried that steps but the flash tool gets an error: Error Code 0x2000 Flashing Failed.
What must I do now?
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by (Genius) (10.4m points)
I hear. Are you rooted otherwise? I am looking into the error code and mean to reply back shortly.
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by (Contributor) (14.5k points)
Hi
No, I am not rooted, but if it would make things easier I will root it

Thanks!
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by (Genius) (10.4m points)
edited by
Rooting will let you install 'Rom Manager' > use that to install a custom recovery which will let you Backup your 6.0 Marshmallow ROM to in case anything goes wrong. Then you will be able to get on with the downgrade without any risk concern.
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by (Contributor) (14.5k points)
Hi
I just want to let you know that I managed to flash the old software, I just downloaded the "Europe General" and not the other one and the flashing process went fine. Thanks for all your help and enjoy your weekend! :-)
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by (Genius) (10.4m points)
We are glad to hear, robbie :)
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by (Contributor) (14.5k points)
Hi

Sorry to bother again, but now I notice every time I power the phone on it gives me a warning that says:
"Current version is not available for user. Can't find matched cust for NT-code mcc/mnc[FFFFFF], subset[72]". Do you think that I must completely wipe the os from the phone and reflash it? Or do you think it is because I flashed a Europe file into a South African device?

Thank you :-)
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by (Genius) (10.4m points)
This is what we do so never fret :) Yes a full flash may be necessary but I hope to confirm that shortly.
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by (Contributor) (14.5k points)
Hi


Thank you very much! :-)
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by (Genius) (10.4m points)
Hi. It turns out to be that this is a ROM version issue. Something about (though not too serious) the connection/relation between the countries the ROM has on its list and the country your carrier is currently registered with or connected to - seemingly, this is queried each time your SIM registers to network. I am trying to look up the exact H815P if I may.
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by (Genius) (10.4m points)
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by (Contributor) (14.5k points)
Hi
Thank you, I would appreciate that very much!
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by (Genius) (10.4m points)
And yes, H815P proves to have surfaced. See my 2nd last comment.
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by (Contributor) (14.5k points)
Ok, I will download it and let you know, thanks!
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by (Contributor) (14.5k points)
Hi
I just want to let you know that I have flashed the other software and it worked! There isn't a warning at startup anymore, thanks! :-)

I appreciate all your help!
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by (Genius) (10.4m points)
We are glad it worked well!

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