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[Please help] How to downgrade vivo y51l to stock rom safely?

#1

I have a vivo y51l (Qualcomm) android phone. I sent it to service center to enable volte and they enabled it and upgraded it higher version of android.

But after this battery is draining very fast and I contacted service center again to downgrade it but they said ____they can't downgrade it to stock rom.


So pls suggest me a safe way to flash stock rom so that I don't lose my imei and nvram etc.


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#2
(06-27-2017, 05:51 PM)LoverOfLove Wrote: I have a vivo y51l (Qualcomm) android phone.  I sent it to service center to enable volte and they enabled it and upgraded it higher version of android.

But after this battery is draining very fast and I contacted service center again to downgrade it but they said ____they can't downgrade it to stock rom.


So pls suggest me a safe way to flash stock rom so that I don't lose my imei and nvram etc.

What is your current Android version. Do you have the lower version stock ROM you wish to downgrade to using Qfil

Sent from my Infinix X510 using Hovatek Forum
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#3
(06-27-2017, 11:41 PM)maxpayne Wrote:
(06-27-2017, 05:51 PM)LoverOfLove Wrote: I have a vivo y51l (Qualcomm) android phone.  I sent it to service center to enable volte and they enabled it and upgraded it higher version of android.

But after this battery is draining very fast and I contacted service center again to downgrade it but they said ____they can't downgrade it to stock rom.


So pls suggest me a safe way to flash stock rom so that I don't lose my imei and nvram etc.

What is your current Android version. Do you have the lower version stock ROM you wish to downgrade to using Qfil

Sent from my Infinix X510 using Hovatek Forum
current android version is 5.1 ............ and lower 5.0.2 is available on some sites...

i'm asking becouse i dont have any experiance with qualcomm flashing...
i know that with sp flash tool ,,,, upgrade option instead of download will solve any problem related related to upgrade or download...
but i dont know if i can do that with qualcomm flashing tool.
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#4
(06-28-2017, 05:01 PM)LoverOfLove Wrote: current android version is 5.1 ............ and lower 5.0.2 is available on some sites...

i'm asking becouse i dont have any experiance with qualcomm flashing...
i know that with sp flash tool ,,,, upgrade option instead of download will solve any problem related related to upgrade or download...
but i dont know if i can do that with qualcomm flashing tool.

using QFIL isn't so difficult, you just need to be sure that whatever firmware you plan to download to is the right one

Sent from my Infinix X510 using Hovatek Forum
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#5
(06-28-2017, 11:29 PM)maxpayne Wrote:
(06-28-2017, 05:01 PM)LoverOfLove Wrote: current android version is 5.1 ............ and lower 5.0.2 is available on some sites...

i'm asking becouse i dont have any experiance with qualcomm flashing...
i know that with sp flash tool ,,,, upgrade option instead of download will solve any problem related related to upgrade or download...
but i dont know if i can do that with qualcomm flashing tool.

using QFIL isn't so difficult, you just need to be sure that whatever firmware you plan to download to is the right one

Sent from my Infinix X510 using Hovatek Forum

I just want make sure that flashing lower android version is safe in qfil for imei and nvram! Is it?
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#6
(06-29-2017, 06:52 PM)LoverOfLove Wrote: I just want make sure that flashing lower android version is safe in qfil for imei and nvram! Is it?

You can backup EFS with QPST (QFIL)

Sent from my Infinix X510 using Hovatek Forum
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