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Hey guys, i need some experts. Anyway, i own p9 lite L31C440B160 and i want to update to nougat, badly. However, i cant find any firmware with my number c440, does it even matter?
Can you please help me update to b370 or similar. I need it badly. Also, do i need to unlock bootloader on my p9 lite to flash custom roms?
btw, my phone is vendor:ee country:gb
faruk.foco said:
Hey guys, i need some experts. Anyway, i own p9 lite L31C440B160 and i want to update to nougat, badly. However, i cant find any firmware with my number c440, does it even matter?
Can you please help me update to b370 or similar. I need it badly. Also, do i need to unlock bootloader on my p9 lite to flash custom roms?
btw, my phone is vendor:ee country:gb
Click to expand...
Click to collapse
You have to debrand your phone...
That presume: unlock bootloader + twrp + root + (prepare in dload folder a C432 - B160/B161 firmware) + flash oeminfo C432 + repair firmware with dload folder.
It is a lot to do and somethings may goes wrong resultin in bricking your phone...
If you assume the risks, after that you have a C432 - B160/B161 phone which can be updated to B370/B371 via Firmware Finder.
gtdaniel said:
You have to debrand your phone...
That presume: unlock bootloader + twrp + root + (prepare in dload folder a C432 - B160/B161 firmware) + flash oeminfo C432 + repair firmware with dload folder.
It is a lot to do and somethings may goes wrong resultin in bricking your phone...
If you assume the risks, after that you have a C432 - B160/B161 phone which can be updated to B370/B371 via Firmware Finder.
Click to expand...
Click to collapse
Soooo all in all its not worth it? Thank man anyway...
faruk.foco said:
Soooo all in all its not worth it? Thank man anyway...
Click to expand...
Click to collapse
You have to decide if worth or not...
gtdaniel said:
You have to decide if worth or not...
Click to expand...
Click to collapse
Since you are here and obviously know a lot more about p9 lite than me, can you please find me a guide to do stuff that you told me to do. I know it's a lot to ask for, but I've been grinding all week trying to find guides etc and couldn't. Thanks in advance!
faruk.foco said:
Since you are here and obviously know a lot more about p9 lite than me, can you please find me a guide to do stuff that you told me to do. I know it's a lot to ask for, but I've been grinding all week trying to find guides etc and couldn't. Thanks in advance!
Click to expand...
Click to collapse
What you have to do i already said but you have to read arround here to do followings...
1. From anywhere you are (B336, B329, B170-160-130) you have to prepared in dload folder a B160/B161 stock firmware (B160 for Dual Sim, B161 for Single Sim).
2. Flash oeminfo/custom.bin (for SS phone or DS phone ) for your phone localisation: C150, C185, C432.
3. After that firmware become corrupted and need to be repaired from dload folder via 3 keys pressed / dialer code / emui error message.
4. Once you have a functional B160/B161 firmware install Firmware Finder (+proxy addon) and check <Use new firmware> and <Use system updater>.
5. Reconfigure WI-Fi connection from indications in Firmware Finder Proxy.
6. Search for B370/B371 firmware (B370 for DS, B371 for SS) of 1,94 Gb size for your phone localisation and send it to updater.
7. From there it is downloaded, verified and reboot to emui updater wich make his work and bring you B370/B371 firmware.
PS: - for flashing oeminfo/custom.bin i recomand this tool which make that work just fine.
https://forum.xda-developers.com/hu...nt/europe-vns-l31-toolkit-bootloader-t3432873
- if you have a flash-able zip of oeminfo/custom.bin i recommend flashing with twrp.
gtdaniel said:
What you have to do i already said but you have to read arround here to do followings...
1. From anywhere you are (B336, B329, B170-160-130) you have to prepared in dload folder a B160/B161 stock firmware (B160 for Dual Sim, B161 for Single Sim).
2. Flash oeminfo/custom.bin (for SS phone or DS phone ) for your phone localisation: C150, C185, C432.
3. After that firmware become corrupted and need to be repaired from dload folder via 3 keys pressed / dialer code / emui error message.
4. Once you have a functional B160/B161 firmware install Firmware Finder (+proxy addon) and check <Use new firmware> and <Use system updater>.
5. Reconfigure WI-Fi connection from indications in Firmware Finder Proxy.
6. Search for B370/B371 firmware (B370 for DS, B371 for SS) of 1,94 Gb size for your phone localisation and send it to updater.
7. From there it is downloaded, verified and reboot to emui updater wich make his work and bring you B370/B371 firmware.
PS: - for flashing oeminfo/custom.bin i recomand this tool which make that work just fine.
https://forum.xda-developers.com/hu...nt/europe-vns-l31-toolkit-bootloader-t3432873
- if you have a flash-able zip of oeminfo/custom.bin i recommend flashing with twrp.
Click to expand...
Click to collapse
Thank you very much man!!
Vns p31c636b170 how to install naugat in this ,
if some have zip file link that's better, or any suggestions please
How can I debrand my phone ? I mean going from C02 to C432 ?
Can anyone point out the steps needed ?
Thanks
bunilla said:
How can I debrand my phone ? I mean going from C02 to C432 ?
Can anyone point out the steps needed ?
Thanks
Click to expand...
Click to collapse
Unlock bootloader + TWRP + root + flash oeminfo of C432 + repair firmware via dload folder.
gtdaniel said:
Unlock bootloader + TWRP + root + flash oeminfo of C432 + repair firmware via dload folder.
Click to expand...
Click to collapse
which option in the toolkit should be pressed to put Oeminfo,upgrade button or individual?
gtdaniel said:
Unlock bootloader + TWRP + root + flash oeminfo of C432 + repair firmware via dload folder.
Click to expand...
Click to collapse
I have L31 and I want to debrand it from C440 to C432. I did some research, but still I have some questions.
1. Unlock bootloader + TWRP + root - I found this https://forum.xda-developers.com/huawei-p9lite/how-to/guide-unlock-bootloader-twrp-root-t3405701
It's ok right ?
2. Flash oeminfo of C432 and this should be done by SRKTool and oeminfo I found there https://forum.xda-developers.com/hu...nt/europe-vns-l31-toolkit-bootloader-t3432873
3. repair firmware via dload folder - Unfortunately I don't know how to do it. In the instructions for p9, it was done also in SRKTools using "Install Recovery 6.0", but there P9Lite is not mentioned, how should I do ?
4. Install new ROM - I should install new ROM for c432, right ? It's using 3 button method ?
And that's all ?
smackedRico said:
I have L31 and I want to debrand it from C440 to C432. I did some research, but still I have some questions.
3. repair firmware via dload folder - Unfortunately I don't know how to do it. In the instructions for p9, it was done also in SRKTools using "Install Recovery 6.0", but there P9Lite is not mentioned, how should I do ?
4. Install new ROM - I should install new ROM for c432, right ? It's using 3 button method ?
And that's all ?
Click to expand...
Click to collapse
Regarding <3. repair firmware via dload folder>, you have to download stock firmware for C432 (B130/131 or B160/161 - depends what oeminfo you flash),
unzip update.app and copied on dload folder on microsdcard. Power off and power on with 3 key combination and repair start...
At the end you have a brand new C432B1XX phone...
gtdaniel said:
Regarding <3. repair firmware via dload folder>, you have to download stock firmware for C432 (B130/131 or B160/161 - depends what oeminfo you flash),
unzip update.app and copied on dload folder on microsdcard. Power off and power on with 3 key combination and repair start...
At the end you have a brand new C432B1XX phone...
Click to expand...
Click to collapse
And the bootloader should be locked, right ?
smackedRico said:
And the bootloader should be locked, right ?
Click to expand...
Click to collapse
Indeed, you lose bootloader unlock, twrp and root (if you have).
If now I have c440B160, and I place oeminfo for c432 do i have to install c432b160 or I can install c432b131, because I only found that version
I installed TWRP and Root, and now I don't know how to change oeminfo, because in srk is only p9,not p9 lite, and I downloaded package .zip and tried to install it by TWRP but it didn't work. How should i do this ?
Ministry of solutions has a full tutorial, I used it and it worked flawlessly
Sent from my HUAWEI VNS-L21 using Tapatalk
Ok, thank. That worked. But now I try to update phone by using firmware finder. It finds me a lot of versions and I downloaded the newest b381 full ota, and it failed, because something was wrong in that package
What u debranded to?
Sent from my HUAWEI VNS-L21 using Tapatalk
Now i have c432b160, at least it sey so. I used the ministry of solutions oeminfo and rom.
Now I use firmware finder to find new versions, and it finds me a lot of them so I send b381 full ota to updater, it downloads, and then reboots, but it find verification error. How to fix it, i want to update to emui 5.0. Now I have C432B160
smackedRico said:
I have L31 and I want to debrand it from C440 to C432. I did some research, but still I have some questions.
1. Unlock bootloader + TWRP + root - I found this https://forum.xda-developers.com/huawei-p9lite/how-to/guide-unlock-bootloader-twrp-root-t3405701
It's ok right ?
2. Flash oeminfo of C432 and this should be done by SRKTool and oeminfo I found there https://forum.xda-developers.com/hu...nt/europe-vns-l31-toolkit-bootloader-t3432873
3. repair firmware via dload folder - Unfortunately I don't know how to do it. In the instructions for p9, it was done also in SRKTools using "Install Recovery 6.0", but there P9Lite is not mentioned, how should I do ?
4. Install new ROM - I should install new ROM for c432, right ? It's using 3 button method ?
And that's all ?
Click to expand...
Click to collapse
Do not debrand to c432 in srktool hope you didnt do it in srktool the c432 i only for normal P9 i once misd flashed it and i got vns-c432b160 i didnt have l21 or 31 nor anything and it was a pain in the a s s to fix
Hi Guys.
Maybe somebody can help here:
I am on B161 and get the OTA Update for B371 - but only the 2.5GB version! And with this update, bluetooth and many more things don't work.
What can I do to Upgrade to nougat? Which Version should I use? How to upgrade correctly?
I don't get the full B371 Upgrade option in the system. And when i Install the B371 Image from Firmware Finder (VNS-L31C432B371 FullOTA-MF-PV) its not working either...
PLEASE help, Nougat has a much better Ram Usage und battery life then MM on my P9 Lite 2GB Variant.....
Thanks!
Better wait.
Nougat has battery drain.
Johnny TDN said:
Better wait.
Nougat has battery drain.
Click to expand...
Click to collapse
But the thing is -> i have the Update available to B371 but it is only the 2,5gb version and i'm thinking will this update be replaced with another one or am i stuck on this update the system wants to give me...
If your phone is stock and update is available via System Updater, go for it!
You have nothing to lose...
gtdaniel said:
If your phone is stock and update is available via System Updater, go for it!
You have nothing to lose...
Click to expand...
Click to collapse
I was on B371 before but had the issue with bluetooth not working etc. Then i did the rollback package and afterwards went back to B161 - so i suppose its not really stock?
I'm just thinking - now i am on B161 and B371 Update is visible for me - but only the 2.5GB variant - and i don't want to update and have the same issues and again do the rollback and loose all my data?
Also i don't really now what it means exactly to be on "Stock" rom - because i think B161 is the actual Stock rom for now?
EDIT: Also i See i have the Firmware VNS-L31 but my Model is actually VNS-L21 so thats weird too.
e-coder said:
I was on B371 before but had the issue with bluetooth not working etc. Then i did the rollback package and afterwards went back to B161 - so i suppose its not really stock?
I'm just thinking - now i am on B161 and B371 Update is visible for me - but only the 2.5GB variant - and i don't want to update and have the same issues and again do the rollback and loose all my data?
Also i don't really now what it means exactly to be on "Stock" rom - because i think B161 is the actual Stock rom for now?
EDIT: Also i See i have the Firmware VNS-L31 but my Model is actually VNS-L21 so thats weird too.
Click to expand...
Click to collapse
Stock phone means unaltered phone (firmware official, bootloader lock, stock recovery etc)
If you have VNS-L31 firmware on VNS-L21 phone is not ok... So your phone is altered...
gtdaniel said:
Stock phone means unaltered phone (firmware official, bootloader lock, stock recovery etc)
If you have VNS-L31 firmware on VNS-L21 phone is not ok... So your phone is altered...
Click to expand...
Click to collapse
Ok Thanks!
I tried the update now and as supposed it is the update with the nrdm900 test-key
what would be best to do? do the rollback to vns-l21c432b161 and wait? i think this firmware version would be stock?
e-coder said:
Ok Thanks!
I tried the update now and as supposed it is the update with the nrdm900 test-key
what would be best to do? do the rollback to vns-l21c432b161 and wait? i think this firmware version would be stock?
Click to expand...
Click to collapse
First of all you have to bring your phone on stock condition (VNS-L21C432B131).
After that you have to apply a B161 official update.
And from there, with Firmware Finder you go to B371.
gtdaniel said:
First of all you have to bring your phone on stock condition (VNS-L21C432B131).
After that you have to apply a B161 official update.
And from there, with Firmware Finder you go to B371.
Click to expand...
Click to collapse
Ok i Will update to the rollback package. After that i will update to B131. Do you have a link for that?
EDIT: Found the Link here http://firmware.smartphonewp.com/do...irmware-version-b131-android-6-0-marshmallow/
And when i am on B131 can I Update via system Updater to b161 ?
e-coder said:
Ok i Will update to the rollback package. After that i will update to B131. Do you have a link for that?
EDIT: Found the Link here http://firmware.smartphonewp.com/do...irmware-version-b131-android-6-0-marshmallow/
And when i am on B131 can I Update via system Updater to b161 ?
Click to expand...
Click to collapse
http://update.hicloud.com:8180/TDS/data/files/p3/s15/G1164/g104/v54896/f1/full/update.zip
gtdaniel said:
http://update.hicloud.com:8180/TDS/data/files/p3/s15/G1164/g104/v54896/f1/full/update.zip
Click to expand...
Click to collapse
Thanks man! you're great!
And when B131 is installed will i get B161 via system update?
e-coder said:
Thanks man! you're great!
And when B131 is installed will i get B161 via system update?
Click to expand...
Click to collapse
Yes, that it should be if everything works fine.
gtdaniel said:
Yes, that it should be if everything works fine.
Click to expand...
Click to collapse
lol ok i did the rollback with the rollback package which obviously only changes the oeminfo to VNS-L31C900B300 (as mentioned in another post to rollback from Nougat to MM)
Now when I try to Install the B131 Package with dload method it says the firmware doesnt fit. The build is not correct for this device
EDIT: i try now to install it via Firmware Finder, lets see if theres better luck with that - Or should I ? The update has only 1,5GB - that confuses me Allthough i selected the FULL OTA
e-coder said:
lol ok i did the rollback with the rollback package which obviously only changes the oeminfo to VNS-L31C900B300 (as mentioned in another post to rollback from Nougat to MM)
Now when I try to Install the B131 Package with dload method it says the firmware doesnt fit. The build is not correct for this device
EDIT: i try now to install it via Firmware Finder, lets see if theres better luck with that - Or should I ? The update has only 1,5GB - that confuses me Allthough i selected the FULL OTA
Click to expand...
Click to collapse
Man, you are in twilight zone if your VNS-L21 phone have VNS-L31 firmware...
I said earlier: First of all you have to bring your phone on stock condition (VNS-L21C432B131).
That you have to do first!
gtdaniel said:
Man, you are in twilight zone if your VNS-L21 phone have VNS-L31 firmware...
I said earlier: First of all you have to bring your phone on stock condition (VNS-L21C432B131).
That you have to do first!
Click to expand...
Click to collapse
Man I tried Tried to do the upgrade via dload method - doesnt work. I tried to install B131 via Firmware Finder - didnt work he cant do it - while verifying the update package switches a few times from 0 to 1 % and after some times he says the package is corrupt.
Can I go just higher than B371 to get everything working again?
Or flash back to B131 with some TWRP or something like that?
Or maybe try to flash the B371 with firmware finder again? That version where it says FullOTA-MF-PV (whatever PV means)
If i was you, i do following:
- first, i make sure if my phone is VNS-L21 (very important!)
- put in dload folder on microsdcard, update.app from B161 firmware: http://update.hicloud.com:8180/TDS/data/files/p3/s15/G1164/g104/v66051/f1/full/update.zip
- flash via twrp oeminfo from this link: https://mega.nz/#!Egl01ZpJ!g1K9xV2yZ4oyoBKxFMOWgghTTUzqLUBoBeXkUboCi-A
- start phone with 3 keys combination and let firmware to repair itself.
gtdaniel said:
If i was you, i do following:
- first, i make sure if my phone is VNS-L21 (very important!)
- put in dload folder on microsdcard, update.app from B161 firmware: http://update.hicloud.com:8180/TDS/data/files/p3/s15/G1164/g104/v66051/f1/full/update.zip
- flash via twrp oeminfo from this link: https://mega.nz/#!Egl01ZpJ!g1K9xV2yZ4oyoBKxFMOWgghTTUzqLUBoBeXkUboCi-A
- start phone with 3 keys combination and let firmware to repair itself.
Click to expand...
Click to collapse
thats what i try - to get back to vns-l21 but no image worked so far .... i will try to update to vns-l21c432b160 firmware with firmware finder maybe that'll work...
what is in this oeminfo file and is there another way to flash it without twrp?
e-coder said:
thats what i try - to get back to vns-l21 but no image worked so far .... i will try to update to vns-l21c432b160 firmware with firmware finder maybe that'll work...
what is in this oeminfo file and is there another way to flash it without twrp?
Click to expand...
Click to collapse
Nope, oeminfo must be flashed via twrp or via some tools (for that is need root).
In that oeminfo file is stock oeminfo for installing VNS-L21C432B161 firmware.
gtdaniel said:
Nope, oeminfo must be flashed via twrp or via some tools (for that is need root).
In that oeminfo file is stock oeminfo for installing VNS-L21C432B161 firmware.
Click to expand...
Click to collapse
Hm okay, so the first problem needs to be solved first - i am in VNS-L31C900B300 now - how can i get back to SOME VNS-L21 image....? as said i tried to dload the B131 Image you gave me the link for but it didnt work to update.
Right now i am trying to install VNS-L21C432B371 FullOTA-MF-PV from FF.... EDIT: Ok that does not work either
e-coder said:
Hm okay, so the first problem needs to be solved first - i am in VNS-L31C900B300 now - how can i get back to SOME VNS-L21 image....? as said i tried to dload the B131 Image you gave me the link for but it didnt work to update.
Right now i am trying to install VNS-L21C432B371 FullOTA-MF-PV from FF....
Click to expand...
Click to collapse
Ok... Good luck, but from my experience i think you can not do something right until you flash oeminfo right for your device...
Hi all,
i own a p9 lite that was on Nougat VNS-L31C432B381 and i decided to rollback to MM. Following Huawei website instructions I downloaded two packages (rollback package and MM) and with 3 buttons method I flash first the rollback package and then MM. All went right and the ROM was stable. After a while of testing (that's why i went to MM), I decided to upgrade to nougat again. From updater it download and install the new android version (1.25 GB). After reboot I noticed that some system app was missing (file manager first). At every reset/factory reset some system app disappear. I repeated the procedure to rollback and upgrade again with the same result. The only way to use the device was to reflash MM and don't upgrade. Here some information I found:
- my starting version was Nougat VNS-L31C432B381
- now I'm on VNS-L31C432B160 (B160 isn't for dual sim? i have the single sim version) stock recovery bootloader locked
- updater try to install VNS-L31C432B370 (instead of B371?)
- if I try upgrade throught updater SN became something like ndr90 test key
- I tried to restore data,syste,vendor,oeminfo ecc.. from backups made with TWRP in Nougat (maybe wahile i was on MM, I'm not sure). It show the correct SN but ROM was still unstable
- I thought to try install full Nougat ROM but i didn't find any package
Can someone help me?
Thank you
The B37x update that the phone automatically finds after rollback doesn't work and will take you to ndr90 test key as you found out B160 is dualsim so you should flash the 161 one. Then use this guide to update through firmwarefinder/proxy https://forum.xda-developers.com/huawei-p9lite/how-to/how-to-b388-nougat-maybe-b381-guide-t3612072
If you want to unlock your bootloader you can also flash B3xx through twrp. If not, the guide above works fine.
Mara-X said:
The B37x update that the phone automatically finds after rollback doesn't work and will take you to ndr90 test key as you found out B160 is dualsim so you should flash the 161 one. Then use this guide to update through firmwarefinder/proxy https://forum.xda-developers.com/huawei-p9lite/how-to/how-to-b388-nougat-maybe-b381-guide-t3612072
If you want to unlock your bootloader you can also flash B3xx through twrp. If not, the guide above works fine.
Click to expand...
Click to collapse
Hi Mara-X and thank you for you answer.
After I write the post i found the B161 package and i decided to give it a try. After flash (all ok) I launched updater again and it download the B371. The update went well and now i'm updating at B381 again throught updater. I think, when it was done, i'll factory reset the device for a clean install. So it seems the problem was B160/161 -single/dual version.
Hello, I have a 2016 p9 lite. I would like to sell it. So I would like to re-lock the bootloader and re-install the original rom.
build number: VNS-L31C432B412
version of EMUI: 5.0.1
Android 7.0 version
How should I do it ? Where can I get the original rom?
Currently I have twrp elite 3.1.1.1 installed and it refuses to boot on the system because: "encryption unsuccessfull: encryption was interrupted and can't complete. As a result, the data on your phone is no longer accessible.
Please help
toto6976 said:
Hello, I have a 2016 p9 lite. I would like to sell it. So I would like to re-lock the bootloader and re-install the original rom.
build number: VNS-L31C432B412
version of EMUI: 5.0.1
Android 7.0 version
How should I do it ? Where can I get the original rom?
Currently I have twrp elite 3.1.1.1 installed and it refuses to boot on the system because: "encryption unsuccessfull: encryption was interrupted and can't complete. As a result, the data on your phone is no longer accessible.
Please help
Click to expand...
Click to collapse
Try to install Service ROM from SD card using dload method.
Link:
https://androidhost.ru/41d
Follow instructions in file "ReleaseDoc". (Read everything carefully before doing anything).
Through this process, your data will be deleted and bootloader will be locked again.
Dload method works with Stock Recovery only, you have to install Stock Recovery first.
toto6976 said:
Hello, I have a 2016 p9 lite. I would like to sell it. So I would like to re-lock the bootloader and re-install the original rom.
build number: VNS-L31C432B412
version of EMUI: 5.0.1
Android 7.0 version
How should I do it ? Where can I get the original rom?
Currently I have twrp elite 3.1.1.1 installed and it refuses to boot on the system because: "encryption unsuccessfull: encryption was interrupted and can't complete. As a result, the data on your phone is no longer accessible.
Please help
Click to expand...
Click to collapse
Hey dude !!
So you bricked the device ....
I don't know why but if you want B412 firmware
you can use @-Alf- guide and re-upgrade via Firmware Finder
to B370 fullota-mf-pv first, then to B412 fullota-mf...
Or download a previous from B412 firmware (ex: VNS-L31C432B410 fullota-mf)
and use HuRupdater method to flash the firmware.
Extract then stock recovery from B410 via Huawei Extractor and flash it via TWRP.
Re-update finally to B412 using Firmware Finder.
I can help you doing this, worked on my ex device but i can't guarantee 100%.
Cheers
Dadditz said:
Hey dude !!
So you bricked the device ....
I don't know why but if you want B412 firmware
you can use @-Alf- guide and re-upgrade via Firmware Finder
to B370 fullota-mf-pv first, then to B412 fullota-mf...
Or download a previous from B412 firmware (ex: VNS-L31C432B410 fullota-mf)
and use HuRupdater method to flash the firmware.
Extract then stock recovery from B410 via Huawei Extractor and flash it via TWRP.
Re-update finally to B412 using Firmware Finder.
I can help you doing this, worked on my ex device but i can't guarantee 100%.
Cheers
Click to expand...
Click to collapse
Please read carefully, Maestro :
"I would like to sell it. So I would like to re-lock the bootloader and re-install the original rom."
Piece.
Hello,
I reinstalled the custom rom that I found on the net: C432B414 with Hurupdater.
It works.
However, the bootloader is still unlocked ... however, I would like to return to the factory configuration with the bootloader locked.
https://www.cjoint.com/c/JItgZO6GuGB
I have the stock recovery install :
https://www.cjoint.com/c/JItg7SqQmdB
I am currently downloading the file indicated by this link : https://androidhost.ru/41d
In the file provided by Alf, there are two files:
'HUAWEI P9 Lite Android7.0 rollback to Android6.0 operation instruction'
'HUAWEI VNS-L31C432B416 Software Upgrade Guideline'
which one do I choose
toto6976 said:
I am currently downloading the file indicated by this link : https://androidhost.ru/41d
In the file provided by Alf, there are two files:
'HUAWEI P9 Lite Android7.0 rollback to Android6.0 operation instruction'
'HUAWEI VNS-L31C432B416 Software Upgrade Guideline'
which one do I choose
Click to expand...
Click to collapse
Unpack downloaded .zip package, you will see two files - ReleaseDoc and Software. Open "Software" and unpack SDUpdate_Package.tar.gaz. Transfer file dload to SD card and follow instructions - there is 'Software upgrade guidline' in file ReleaseDoc.
Edit.:
You can also safely lock BL with OEMINFO flashing and rollback to A6:
-Download OEMINFO:
https://mega.nz/#!xhEwFYLZ!Sv2nB5GERB_js76sAUWxj8hQgsjnf_YPobVbtrxpCew
Transfer it to the SD Card.
Download VNS-L31C432B160 fullupdate.zip:
http://update.hicloud.com:8180/TDS/data/files/p3/s15/G1164/g104/v66015/f1/full/update.zip
Create a folder dload on your SD , unpack downloaded .zip file and copy it to the dload folder.
Install TWRP 3.1.0-2:
https://mega.nz/#!EsESQQhK!uc_lfXEfDW6U7Lq2VeNOYq5OWUID0G-YyhK-oUL4deU
using command
fastboot flash recovery2 twrp.img (OVER eRECOVERY!) , boot in TWRP, fĺash oeminfo.zip , go back to TWRP's main menu, select Reboot and Power Off. Then use three button combo and flash firmware from dload. Your phone will running A6 with locked bontloader. If you want, you can upgrade back to A7 via OTA update or using Fipmware finder.