How can I upgrade my Mate 8 from B180 to B581 - Mate 8 Q&A, Help & Troubleshooting

My Mate 8 Build # is L29C185B180 ... can I upgrade to the Latest L29 Stock Firmware .. without loosing my data?
can I just simply download the latest stock from the server and put it into dload folder in ExtCard .. and manually upgrade?
I've already tried to do a manual upgrade from B180 to B581 but it failed on 5-10% of installation of erecovery .. can somebody please help me ..?

have u tried using the system updater in settings? in any case, whatever you do: MAKE A BACKUP OF YOU DATA! i cannot sufficiently stress the importance of this

Related

Rollback EVA-L09/L19, from Android 7.0 EMUI 5.0 to Android 6.0 EMUI 4.1

Hello !
I found on the Romanian Huawei page this package, used to go back from 7.0 Nougat EMUI 5.0 to 6.0 Loli EMUI 4.1.
UPDATE: for both L09 and L19
It contains a pdf with instructions.
Advice from other users: use an older version of Android 6 MM
I am not responsible for any bricks.
http://consumer.huawei.com/ro/support/downloads/detail/index.htm?id=91624&key0=Mobile%20Phones&key1=Smartphones&key2=EVA-L19
DOWNLOAD
Hit " Thanks" if this helped you
INSTRUCTIONS from the pdf file:
HUAWEI
EVA-LXX EMUI5.0+Android7.0 rollback to EMUI4.1+Android 6.0
Operation instruction
The instruction guides user to roll back from Android7.0 to Android 6.0
1) Roll back operation includes twice SD card update,only through intermediate package
EVA-LXXC900B300, like below:
2) Allow roll back to Huawei official stable release.
Precautions:
1. Make sure the current system version on your phone is an official Huawei version based on Android 7.0. If your phone has been updated with a non-official version, the rollback may fail and even cause unexpected problems.
2. Make sure your phone system version has not been unlocked or rooted.
3. Your personal data will be erased during the rollback. Be sure to back up all your important data beforehand.
4. Prepare a micro SD card with available storage space at least 8 GB.
5. Make sure the battery level is higher than 30%.
6. The rollback includes two local ROM flashing procedures, first from Android 7.0 to the intermediate package version and then from the intermediate package version to Android 6.0.
Step 1: Back up data.
Your personal data will be erased during the rollback. Be sure to back up all your important data beforehand.
To back up data to your micro SD card, go to Tools > Backup, touch backup, and follow the onscreen instructions.
Step 2: Update your phone to the intermediate package version.
Obtain the EVA-LXX intermediate package (UPDATE.APP) by visiting the official EMUI website or calling the customer service hotline.
Load the UPDATE.APP package to the dload folder under your micro SD card root directory. If there is no dload folder under the directory, please create one. (Do not load the UPDATE.APP package to the internal storage.)
When the phone is powered off, press and hold the volume up, volume down, and power buttons simultaneously to enter forcible update mode. Release the buttons only after the rollback starts. Do not operate the phone during the rollback.
Step 3: Confirm the intermediate package version.
When the phone is powered on, go to Settings > About phone and check whether the displayed version number contains EVA-LXXC900B300.
Step 4: Update the phone from the intermediate package version to Android 6.0.
Download an older version of Android 6.0 full package (UPDATE.APP) for the EVA-LXX from the EMUI official website. Load the UPDATE.APP package to the dload folder under your micro SD card root directory. (Do not load the UPDATE.APP package to the internal storage.)
When the phone is powered off, press and hold the volume up, volume down, and power buttons simultaneously to enter forcible update mode. Release the buttons only after the rollback starts. Do not operate the phone during the rollback.
Step 5: Confirm the system version and restore data( better not).
When the phone is powered on, go to Settings > About phone and check whether the displayed EMUI version is EMUI 4.1 and Android version is 6.0.
Go to Tools > Backup, locate the desired backup record, and follow the onscreen instructions to restore.
It's everywhere now. Here in Bulgaria too. So hard to go back. Wish HiSuite was better and just connect your phone and install stable version, something like iTunes. I am not so advanced on Android, recently switched from iPhone and really want to test the Nougat on this beautiful phone, but if it's bad I will have to buy SD card and do all this crap just to get to stable os... Ain't worth it.
P.S: What this part means "6. The rollback includes two local ROM flashing procedures, first from Android 7.0 to the intermediate package version and then from the intermediate package version to Android 6.0." What is intermediate package version?
it means that it's a 2 step downgrade.
first you flash the update.app in the zip attached (intermidiate package ).
then you flash your desired version of Android 6.
it's not that difficult. and you can do it from the internal memory also via the 3 button combo method
It worked with my L19C432 that was running L19C432B322. Thanks.
Confirmed that it works on L09C432 to, so it's not just for L19.
I can go back to 6.0 but I can not apply theme how to solve please help
Has anyone tried this with L09c636 or L19c636?
RidgeBoyGenius said:
Has anyone tried this with L09c636 or L19c636?
Click to expand...
Click to collapse
Since it's a C900 cust Rolleback it works on all Cust, C636, C432, C185 ..... etc.... L19 or L09 it's the same.
Mostar088 said:
Since it's a C900 cust Rolleback it works on all Cust, C636, C432, C185 ..... etc.... L19 or L09 it's the same.
Click to expand...
Click to collapse
Wonderful news, thank you!
It doesn't work with me : the rollback of B300 to B182 failed.
EDIT : In fact, it didn't work because I didn't have enough battery...
Trying this now I'm L09 C432, what a ballache!
---------- Post added at 01:27 PM ---------- Previous post was at 12:53 PM ----------
This worked for me just fine, thanks OP
Still really hate this phone, well done Huawei :clap:
Themes are not working after rollback...
rudnik8 said:
Themes are not working after rollback...
Click to expand...
Click to collapse
Did you found a solution? I am experiencing the same problem. After downgrading to Android 6 themes don't work. Also i've installed L19C432B180 and when searching for an update its saying its the latest version. I upgraded to Nougat from B182 wich was an OTA update and now i can receive it anymore.
I think Nougat did something to system partion and now after downgrade not everything its working properly.
I'm on L09C432 in UK.. and was considering upgrading..
Is 7.0 N That bad... Ive read its a Leaked version, which usually means Beta... but Ive read a few forums where people are rolling back
Would you recommend staying on B182 for now...
The official beta is quite good, but you can't get in the list anymore. From what i have read, the leaked one is not that ok. I recommend 182 for now
Sent from my EVA-L19 using XDA-Developers mobile app
I had a nightmare with up and downgrade last night. I thought i've broken my new phone but i've managed it to get it working again without any problems (themes also do work here).
What have i all done, for the reason someone else have troubles with downgrading.
Tip: Do not try to backup anything, it will most likely will make things even worse. Wipe and flash without later importing backups from different builds.
My phone: P9 (L19) DualSim
New phone, directly unlocked bootloader and removed OEM protection
Installed TWRP 3.0.2.0
Opened recovery and installed directly the BETA image for my L19
Until this point all works fine. BETA image is buggy, keyboard not working and freezes sometimes
Decided to go back to stock
TWRP is not working anymore, stuck in "Your device is booting"
Always running into Huawei eRecovery, where you can do noting. Repair always fails
Downloaded latest stock image for my L19 and tried the here suggested steps
Note: Before doing the "dload" flash you need to flash stockrecovery, as far as i know and other threads suggest it too
First Update.app flash (from the zip file here) worked fine
Second Update.app flash from the stock rom stuck at 5% and closed with an error
Hours of trying different things, all not working (Other TWRP recovery version with encryption support, wipes, resets, etc...)
Last try: Download an older stock image of my L19. Flash successfully done. Phone boots now into stock rom :good:
Locked Bootloader again (i guess it have been done by the stock rom flash)
Now i'm completely back to stock - Which is currently the best available rom for this phone, IMHO.
Conclusion: The most headache i got from downloading the wrong (too new) stock image. Trying an older one have solved my flash problems.
BrainFooLong said:
I had a nightmare with up and downgrade last night. I thought i've broken my new phone but i've managed it to get it working again without any problems (themes also do work here).
What have i all done, for the reason someone else have troubles with downgrading.
Tip: Do not try to backup anything, it will most likely will make things even worse. Wipe and flash without later importing backups from different builds.
My phone: P9 (L19) DualSim
New phone, directly unlocked bootloader and removed OEM protection
Installed TWRP 3.0.2.0
Opened recovery and installed directly the BETA image for my L19
Until this point all works fine. BETA image is buggy, keyboard not working and freezes sometimes
Decided to go back to stock
TWRP is not working anymore, stuck in "Your device is booting"
Always running into Huawei eRecovery, where you can do noting. Repair always fails
Downloaded latest stock image for my L19 and tried the here suggested steps
Note: Before doing the "dload" flash you need to flash stockrecovery, as far as i know and other threads suggest it too
First Update.app flash (from the zip file here) worked fine
Second Update.app flash from the stock rom stuck at 5% and closed with an error
Hours of trying different things, all not working (Other TWRP recovery version with encryption support, wipes, resets, etc...)
Last try: Download an older stock image of my L19. Flash successfully done. Phone boots now into stock rom :good:
Locked Bootloader again (i guess it have been done by the stock rom flash)
Now i'm completely back to stock - Which is currently the best available rom for this phone, IMHO.
Conclusion: The most headache i got from downloading the wrong (too new) stock image. Trying an older one have solved my flash problems.
Click to expand...
Click to collapse
I found the same procedure to work. What really puzzled me was that the flashing of update.app "crashed" at 5%. I also tried all sort of solutions, with only new error messages as result.
The final solution to flash an older image was not exactly obvious
i will update OP. thank you for sharing
I tried 2 versions, still gives me errors. Could someone provide the exact version of the rom used in rollback?

dload Update.app method, entering TRWP instead

Hey Guys..
Bought a L29 Mate 8 last week, have been able to unlock, root but now want to install some custom roms..
The installations instructions tell me to go (back) to a stock B1xx rom through the "dload method", and next upgrade to a stock B3xx rom through the "dload" method.
I'm running stock B170, rooted/unlocked right now.
I've loaded a stock B3xx update.app file on my phone, but i'm unable to get the phone to run this update, it either boots normal to system, or when I use vol+/vol-/power it boots into TRWP instead.
Other instructions mention a setting to run update manual going through settings/update but can't find a "manual update"" setting there.
Hope you guys can help me going with this one...
Thanks
You need to flash stock recovery back,use srk tools.
gm007 said:
You need to flash stock recovery back,use srk tools.
Click to expand...
Click to collapse
Thanks for your quick reply, still a little lost here, will give that a try..
Thanks
Regan078 said:
Thanks for your quick reply, still a little lost here, will give that a try..
Thanks
Click to expand...
Click to collapse
That did the trick, it will "force" manual update now.
Now I run in another problem though, stock rom links for my "NXT-L29C636" are not available, link for C185B170 was still working and the only B320 stock i could find was the one shared by user "bluheart" in his signature "C185B320"
So decided to rebrand the device to C185 with SRK Tool so I would be able to flash these stock roms, first flashed C185B170 through dload method with no problem, and from there tried to flash C185B320 but update does not get passed 5%.
The rom version listed in the device is somehow NXT-C900B170, using the "* # * # 2846579 # * # *" code in dialer confirms phone is "C185 - Africa / Middle East"
Any pointers ?
(edit: tried to reflash C185B170 through download method, also gets stuck @5%)
Thanks
Now in about phone it show C900B170?
Can you get an ota update via updater?
The latest c185B200 so start from this one.
http://update.hicloud.com:8180/TDS/data/files/p3/s15/G1076/g104/v65326/f1/full/update.zip
Or you need to root B170 and change build display and oem info to C185 in srk tools.after this you will be able to dload c185b320
gm007 said:
Now in about phone it show C900B170?
Can you get an ota update via updater?
The latest c185B200 so start from this one.
http://update.hicloud.com:8180/TDS/data/files/p3/s15/G1076/g104/v65326/f1/full/update.zip
Click to expand...
Click to collapse
Thanks again for your help...
Used SRK Tools to change ROM version from "NXT-C900B170" to installed "NXT-L29C185B170" in the hope this miss match prevented the update, no luck, also no OTA available.
Thanks for the link, will download this and try to get this going first...
(edit: Changing OEM, SRK Tools read the device as AL-10?, changed to C185, fingers crossed)
Regan078 said:
Thanks again for your help...
Used SRK Tools to change ROM version from "NXT-C900B170" to installed "NXT-L29C185B170" in the hope this miss match prevented the update, no luck, also no OTA available.
Thanks for the link, will download this and try to get this going first...
Click to expand...
Click to collapse
Yes flash b200 like you are debranding,I mean change build prop display and oem info to c185.
ro.build.display.id=NXT-L29C185B002
gm007 said:
Yes flash b200 like you are debranding,I mean change build prop display and oem info to c185.
ro.build.display.id=NXT-L29C185B002
Click to expand...
Click to collapse
Had no luck with the C185 roms, they all got stuck at 5%, decided to rebrand back to C636 and dload the original NXT-L29C636B170 and that worked, so will create a TRWP backup from here to fall back on.
Will give the rebranding to C185 another try later, with the rom you provided (i wonder if i went wrong somewhere with all rom downloads named "Update.zip" I might have mixed something up)
Maybe you/anybody confirm I take the right steps to rebrand to C185 and update to the NXT-L29C185B200 ROM provided.
Using SRK Tool: (current: NXT-L29C636B170/Rooted/Bootloader Unlocked)
1-Install TRWP
2-Change OEM from C636 to C185
3-Change ro.build.display.id=NXT-L29C636B170 to NXT-L29C185170 or NXT-L29C185B200 ?
4- Copy NXT-L29C185B200 "update.app" to device/dload
5- Install Original Recovery
6- Use vol+/vol-/power to apply B200 update
8-Install TRWP/ create Backup
9- Root ?
10- Copy NXT-L29C185B320 "update.app" to device/dload
11- Install Original Recovery
12- Use vol+/vol-/power to apply B320 update
Thanks in advance....
Debranding
anyone tell where to email for bootloader unlock if website is not recognizing my phone.
updated to B200
Thanks for your help gm, just made a new attempt and now successfully picking up the updates as a C185.
Getting ready for a custom rom

Plz i need some help with my Mate 8

hi friends,
I just bought Mate 8 l29C636 it was with firmware B103, i update it to B193 and all work like a charm.
My problems begin when i saw a tuto about Firmware Finder to update my mate 8 to B563 Nougat 7.
i launch download with proxy method and installed like a charm after that i want to wipe my data to have fresh mate 8 with emui 5 and android 7 and there i had a error message and wipe data failed , i cant launch my mate 8 after that i had message with red color.
i try to rollback with HUAWEI_Mate8_NXT-L29_Rollback_Package_from_EMUI5.0+Android7.0 rollback to EMUI4.0+Android 6.0_C900B500
and after to install HUAWEI_Mate_8_Firmware_NXT-L29B_Andriod 6.0_EMUI 4.0_C636B193_05013LYB and it installed witout error.
but when i launch my mate 8 i accept term and all bu i lost keyboard and its look like my mate 8 dont change version always on nougat 7.
help how can i solve this problem plz and i dont have unlocked bootloader.
Did u try dload official mm for your region
h4ni said:
Did u try dload official mm for your region
Click to expand...
Click to collapse
i install it but after that i lost themes and some options and icons are so big how can i solve it plz friend
when i do wipe factory data , in reboot i have this message never see before
your phone has been encrypted with logo android and after it reboot but without theme solved
PROBLEM SOLVED WITH UNLOKING BOOTLOADER AND INSTALLING TWRP RECOVERY Finaly i root the Mate 8.
thanks for help
walidovich02 said:
when i do wipe factory data , in reboot i have this message never see before
your phone has been encrypted with logo android and after it reboot but without theme solved
Click to expand...
Click to collapse
To solve them problen , you need to unlock bootloader and you have two way
1- flash userdata.img you can use huawei extractor to get it
And then flash userdata.img using fastboot
2-user srk tools to push userdata
From utulity option
walidovich02 said:
hi friends,
I just bought Mate 8 l29C636 it was with firmware B103, i update it to B193 and all work like a charm.
My problems begin when i saw a tuto about Firmware Finder to update my mate 8 to B563 Nougat 7.
i launch download with proxy method and installed like a charm after that i want to wipe my data to have fresh mate 8 with emui 5 and android 7 and there i had a error message and wipe data failed , i cant launch my mate 8 after that i had message with red color.
i try to rollback with HUAWEI_Mate8_NXT-L29_Rollback_Package_from_EMUI5.0+Android7.0 rollback to EMUI4.0+Android 6.0_C900B500
and after to install HUAWEI_Mate_8_Firmware_NXT-L29B_Andriod 6.0_EMUI 4.0_C636B193_05013LYB and it installed witout error.
but when i launch my mate 8 i accept term and all bu i lost keyboard and its look like my mate 8 dont change version always on nougat 7.
help how can i solve this problem plz and i dont have unlocked bootloader.
Click to expand...
Click to collapse
Hi there
I am planning to do the same as I am on NXT-L29C636B193 at the moment...
I want to update to the latest then do a factory reset? Is that what you meant by wipe data?
How did you wipe the data? Through settings or in recovery or fastboot?
Thanks

Don't getting update to B560 again

My Mate 8 L29 is currently on C432B192 again. I said 'again', because I was already three or four times on EMUI 5. (I tried to root it but it failed Everytime, so I had to rollback)
Yesterday I wanted to try again to root B560 and began to search for the update, but - nothing. I tried it via update app , HiCare app and HiSuite on PC. I don't get the update offered. (I also deleted data and cache of those apps)
I'm currently rooted, so I tried to unroot, install stock boot image and recovery .. but same problem: still not getting the update.
Now I'm wondering why this is happening .. I had that same case before (B192, rooted etc.) and I always got that update offered.
Does anyone have a solution for this ? ( Except the manually method via TWRP .. this was never working for me)
Thank you for your help!
Hello everyone ...
I was trying to root my mate 8 next+L29c185b560 ... And I did with twrp
But I lost all huawie apps like hw care and backup and a lot ... And there is no keyboard and Bluetooth not working ... How can I get my phone to his original state ??? Without root without twrp but with all functions ??? Can any one guide me ?
Rollback from Huawei Mate 8 - Nougat to Stock
kingyourii said:
Hello everyone ...
I was trying to root my mate 8 next+L29c185b560 ... And I did with twrp
But I lost all huawie apps like hw care and backup and a lot ... And there is no keyboard and Bluetooth not working ... How can I get my phone to his original state ??? Without root without twrp but with all functions ??? Can any one guide me ?
Click to expand...
Click to collapse
You need rollback package to get it back to normal.
Since your model is L29 & you are nougat.
Go to this site http://consumer.huawei.com/sg/support/products/downloads/detail/mate-8-sg.htm?id=91647
Download the file
Extract the update.app
Make a folder on your sdcard and name it as dload
put this update.app in that sdcard
now you do the dload method
you can do it two ways
one way is
the 3 finger rule while bootup
just press volume + volume - power button together and hold until you see EMUI verifying package
then release your fingers
it will rollback to marshmallow
now you have to update it to another stock firmware (marshmallow)
remember at this point it is in global firmware it might show build number as C900 or something.
you can check it in the settings - about -> build number
you have to then update it to your model firmware
L29C185BXX
I found the stock firmware from another thread for your model
This is L29C185B200
http://update.hicloud.com:8180/TDS/data/files/p3/s15/G1076/g104/v65326/f1/full/update.zip
once again
download the file,
extract the update.app &
then put the update.app in dload folder on your sdcard
and then do dload method.
second way of dload is
open dialer
type *#*#2846579#*#*
click on "software upgrade"
and then -> SDcard upgrade
follow the instructions on the screen
and it will finish the dload method in next few minutes.
That's it. now you will be on Stock ROM with fully functional OS.
after this you will either get OTA updates or you can download using HiCare
or you can download the stock firmware from another thread
or
you can use firmware finder to get stock firmware for your phone. Get the latest version.
If you finish all these steps then I will tell you how to get to nougat if you have any trouble
Hope you find this information useful.
Lot of effort goes into typing these posts. Please don't forget to click on :good::good::good::good::good: for my posts.
---------- Post added 29th April 2017 at 12:11 AM ---------- Previous post was 28th April 2017 at 11:27 PM ----------
Calvin1997 said:
My Mate 8 L29 is currently on C432B192 again. I said 'again', because I was already three or four times on EMUI 5. (I tried to root it but it failed Everytime, so I had to rollback)
Yesterday I wanted to try again to root B560 and began to search for the update, but - nothing. I tried it via update app , HiCare app and HiSuite on PC. I don't get the update offered. (I also deleted data and cache of those apps)
I'm currently rooted, so I tried to unroot, install stock boot image and recovery .. but same problem: still not getting the update.
Now I'm wondering why this is happening .. I had that same case before (B192, rooted etc.) and I always got that update offered.
Does anyone have a solution for this ? ( Except the manually method via TWRP .. this was never working for me)
Thank you for your help!
Click to expand...
Click to collapse
You are rooted & if I read correctly you also have TWRP installed.
If you are unlocked, rooted & have TWRP - then you can install custom roms.
but if you want stock roms, - you need Stock ROM, Stock Recovery, Locked bootloader.
First you need the rollback package from EMUI4.1 to EMI 4.0 for L29C432 is below
https://www.hidrive.strato.com/lnk/0mlDFqqy
Rollback package for L29 to downgrade from EMUI 5.0 to EMUI 4.0 marshmallow is
http://consumer.huawei.com/sg/support/products/downloads/detail/mate-8-sg.htm?id=91647
So choose the right version based on the firmware you are having on your phone. If you have nougat choose the second link and if you have any other version then choose the first link.
Download the file, extract the update.app
then you have to do dload method
create a folder named dload and put update.app in sd card
then
go to dialer
press *#*#2846579#*#*
select
sdcard upgrade
and then say yes
that's it
you will come back to stock (global) version. build version will be C900BXX
now you need stock firmware for L29C432
you can download the stock firmware from here. Below tis the link for L29C432B180
http://update.hicloud.com:8180/TDS/data/files/p3/s15/G1076/g104/v51244/f1/full/update.zip
Stock firmware for L29C432B192
http://update.hicloud.com:8180/TDS/data/files/p3/s15/G1076/g104/v63059/f1/full/update.zip
Here you have the option to either go for L29C432B180 or L29C432B192. (if you choose B192, then you will save time and reduce few steps, because you will get system update to B560 immediately once you change the region to Ireland in Hicare app)
do the dload method again
extract the file, put the file in dload folder in sdcard ,
either use dialer or use 3 button rule to finish the dload process
now you are on L29C432B180. / L29C432B192
From here you can use another dload method to go to B192 - > system update (OTA) -> B560 or B580
if you get a blank screen - > do factory reset
if you get "verification failed " in red color - > unlock bootloader again and proceed with the steps.
This rollback package will save you in case of any problems.
Once you go to nougat B560
you can update to Kangvip B577 - pre rooted rom - its awesome - Root stable , excellent battery lfie. - everything is working perfectly.
I will give you those steps and links if you succeed in getting to B560 after all these steps.
I am sorry that this is a very long post and many steps but I can assure you that it is worth.
Ultimately you will get to nougat & with full root using Kangvip B577.
Hope you succeed
Lot of effort goes into typing these posts. Please don't forget to click on :good::good::good::good::good: for my posts. it encourages me to help more and answer more Qs

(HELP) I'm lost...

Hello all i need help i have to change my version several times on my honor and i'm lost ... i have not found stable rom (which does not reboot all the time) now I would like to return to a stock version of my honor..
today i'm on emui 5.... FRD-L09C900B300 and i can't ota upgrade....
Someone have a good rom like stock android or emui 5 official ?
Thanks... :crying:
Really..
Have you tried to rollback? Or why do you have FRD-L09C900B300? It's a rollback package.
I suggest you to use dload method to rollback to B131.
netvorCZEK said:
Have you tried to rollback? Or why do you have FRD-L09C900B300? It's a rollback package.
I suggest you to use dload method to rollback to B131.
Click to expand...
Click to collapse
i tried to roll back but now i can't instal a good version
you have a link for dload and rollback in official emui with ota update ?
I have been stuck on B300 also when trying to rollback once or after trying to upgrade via charle method i don't remember. But I end up getting out of it and rolling back to B131 by creating the dload folder with the B131 frimware in my sd-card, and it works. On internal storage it kept telling me something error or invalid packet.
bonne chance
It's good I'm back to stock now I'm gonna do the ghost waiting for a version of the honor 8 lineage os 14.1 stable
i'm on b380 with some update
Merci
frenchtouch92 said:
I have been stuck on B300 also when trying to rollback once or after trying to upgrade via charle method i don't remember. But I end up getting out of it and rolling back to B131 by creating the dload folder with the B131 frimware in my sd-card, and it works. On internal storage it kept telling me something error or invalid packet.
bonne chance
Click to expand...
Click to collapse
i am stuck at C900B300 version. I am on L-09 model. when i am try to follow last step that is create dload folder in sdcard root and save marshmallow app then press power+vol_down+vol_up button update didn’t take. It show software install failed message, update package doesn’t exists!! automatically delete dload folder.Please let me know what i can do to complete downgrade operation

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