Plzzz help im stuck I want to rollback my huawei p9 lite VNS-L31 where its build number is NRD90M(test keys) to marshmallow 6.0 help don't know what to do . Plz if you can explain step by step what can i do because i'm not good in these things , My bluetooth not workng , there no calculator , no software updater , i am not able to check if got update or not and so on......, im stuck plz help
Well hey.. first download this rollback package from this link:
http://download-c1.huawei.com/download/downloadCenter?downloadId=93645&version=371484&siteCode=np
Extract and move all the files to dload folder on your external SD Card then install it with the 3 button method. If there's no dload folder then create one.
So the phone will reboot and now you can downgrade to any mm rom
Now just download this mm rom from this link:
http://update.hicloud.com:8180/TDS/data/files/p3/s15/G1164/g104/v66015/f1/full/update.zip
And again extract and move the files to dload folder on your sd card.. Install with 3 button method.
Done! Everything should work now!
In case If you don't know what the 3 button method is..lol
•Power the phone off ?
•Just press and hold on POWER + VOLUME UP + VOLUME DOWN buttons
The phone will start installing the rom and that's the 3 button method ?❤
this is not working for me. it says incompatibility with current version and to download the correct version.
lennie27 said:
this is not working for me. it says incompatibility with current version and to download the correct version.
Click to expand...
Click to collapse
Man, you have to do entire procedure: unlock bootloader, install twrp for Nougat and flash oeminfo for your phone. Before that you have to put in dload folder MM firmware (B130/B131),
because after flashing oeminfo phone try to repair firmware from dload folder. If repair do not start, power off phone and power on with 3 keys combination.
Hi All,
I'm having a similar issue as lennie27 however I think I might have strayed down an incorrect path during the process of upgrading to Nougat. My device shipped with VNS-L31C16B120 with no updates available through the stock updater. I tried the Firmware Finder guides which listed options for VNS-L31C169B13x and VNS-L31C432B13x however none of these updates would work, updater would say it's incompatible with current version. I also tried manually downloading the VNS-L31C432B160 firmware and installing that with the 3 button method as well as the EngineerMenu option with the same result (found guides that stated needing to be on B160 or B161 before making the jump to Nougat). Eventually I decided to unlock the bootloader and install Nougat through TWRP and followed the obeygeekupdate-huawei-p9-lite-to-android-7-0-nougat-manually guide (can't post links ) on manually installing Nougat (stupidly never paying attention to the fact that it's a beta build guide). I've installed TWRP to the device again using the P9 Lite Toolkit v0.0.0.11 found here on XDA (used this when on MM however the upgrade seemed to restore the stock recovery) with the idea of downloading the build from the ministryofsolutions huawei-p9-lite-vns-l31-nougat-b371-update-stable-europe page and pushing that to the device instead (however now the device doesn't want to boot into recovery)
Now my only concern is, will this work? I've noticed a bit of commenting going back and forth on the ministryofsolutions site which essentially boiled down to the need for debranding the phone (apparently C19 is MTN South Africa specific and I need to debrand it and get it onto C432 Europe before mucking about with Nougat, but alas to late) which seemed to be something I should have done while on MM still. If I can find a full firmware link for VNS-L31C16B120 can I flash that through TWRP without needing to follow any prerequisite steps? So far nothing that I've tried to flash using the three button method has worked, I'd just like to get back onto an official stable firmware again.
Any advice will be appreciated
saintnite said:
Hi All,
I'm having a similar issue as lennie27 however I think I might have strayed down an incorrect path during the process of upgrading to Nougat. My device shipped with VNS-L31C16B120 with no updates available through the stock updater. I tried the Firmware Finder guides which listed options for VNS-L31C169B13x and VNS-L31C432B13x however none of these updates would work, updater would say it's incompatible with current version. I also tried manually downloading the VNS-L31C432B160 firmware and installing that with the 3 button method as well as the EngineerMenu option with the same result (found guides that stated needing to be on B160 or B161 before making the jump to Nougat). Eventually I decided to unlock the bootloader and install Nougat through TWRP and followed the obeygeekupdate-huawei-p9-lite-to-android-7-0-nougat-manually guide (can't post links ) on manually installing Nougat (stupidly never paying attention to the fact that it's a beta build guide). I've installed TWRP to the device again using the P9 Lite Toolkit v0.0.0.11 found here on XDA (used this when on MM however the upgrade seemed to restore the stock recovery) with the idea of downloading the build from the ministryofsolutions huawei-p9-lite-vns-l31-nougat-b371-update-stable-europe page and pushing that to the device instead (however now the device doesn't want to boot into recovery)
Now my only concern is, will this work? I've noticed a bit of commenting going back and forth on the ministryofsolutions site which essentially boiled down to the need for debranding the phone (apparently C19 is MTN South Africa specific and I need to debrand it and get it onto C432 Europe before mucking about with Nougat, but alas to late) which seemed to be something I should have done while on MM still. If I can find a full firmware link for VNS-L31C16B120 can I flash that through TWRP without needing to follow any prerequisite steps? So far nothing that I've tried to flash using the three button method has worked, I'd just like to get back onto an official stable firmware again.
Any advice will be appreciated
Click to expand...
Click to collapse
you need to install nougat recovery, not the one from the toolkit. then twrp will work and the device will boot.
to go back to 120 you need to install oeminfo, and then the update.app
mjz2cool said:
you need to install nougat recovery, not the one from the toolkit. then twrp will work and the device will boot.
to go back to 120 you need to install oeminfo, and then the update.app
Click to expand...
Click to collapse
Thank you for the reply, managed to come right a few hours after posting. Turned out the copy of TWRP that I had on hand was more outdated than I thought, downloaded the newest copy and that worked on the device. Additionally I managed to find a website listing just about every firmware for the phone (Including my original MTN ZA specific variant) so I downloaded that and managed to restore the phone using the three button method. Phone is back to stock now and even the unlocked bootloader nag screen is gone so I'm guessing the bootloader is locked again as well One day when I'm brave enough to attempt this again I'll look at debranding the phone and getting it onto a C432 based ROM before getting it onto Nougat again.
phone bricked
hello guys! im currently on lineage os 14.1 by meticulus, i wanna revert back to stock mm but i cant. i flashed the custom rom from mm using twrp recovery by meticulus, but now i cant even boot into erecovery! can you pls help me!:crying: DLOAD method doesnt work!
Related
Hey people,
I've updated to the unofficial Nougat leak here and ever since I can't get into the recovery. The ROM is OK but no matter what I do I can't get into the recovery. After "adb reboot recovery" I just get stuck in a boot loop and I must get into the upgrade utility and restart phone into the system from there. I've tried to flash few other recovery but nothing works. So far I'm fine with the system and I'd like to also try LineageOS but I have no way to flash the ROM. I have tried "Fastboot flash zip xx.zip" from the bootloader to flash LineageOS but it told me I don't have permissions so it was no good.
So do you folks here have any idea what I did wrong and how to make the recovery work again? I'm kind of learn from the tutorial guy so I'll post the sources I've been using to do the flash.
Unlocking bootloader and flashing new recovery
I've only used the unlock bootloader and flash twrp sections with their provided recovery. I've also tried to flash THIS recovery by Meticulus after the nougat update.
Flashing the ROM + used ROM
Used the old process because upgrade with system utility kept giving me errors.
Model number - VNS-L21
Also if this issue can't be (yet) fixed do you know any way to safely flash ROMs without recovery?
Thanks for any kind of help
You cannot flash any ROM in the nougat recovery, because it does not support /data mounting. Downgrade to MM and install the ROM you want from there.
@SALVO9
Ok, thank you for the reply. I'll probably try to downgrade and flash it afterwards to know which ROM suits me better. All I need to do is find the stock ROM copy it to the phone and restart with all buttons pushed right? Also, do you have any info about when there will be a nougat recovery that can mount /data?
TheAstaros said:
@SALVO9
All I need to do is find the stock ROM copy it to the phone and restart with all buttons pushed right?
Click to expand...
Click to collapse
No.
Flash proper OEMinfo first!
@Schlengge
Thanks for the advice. I did my research because I didn't know a thing about oeminfo and I have hit a wall since my phone is not rooted(Should have mentioned that earlier I know) and I'm supposed to replace custom.bin and then flash the img. So afterwards I searched how to root this nougat ROM and found nothing no app was working and everything I found was just using the phone's recovery which I can't access. Does anything come to mind? I will continue getting through the pages of google but I don't think I'll find anything useful.
EDIT> After some searching I found the official rollback package. I have yet to test it (downloading on slow connection atm) and I hope it will work.
Ok it's finally done and I'm back at old stock ROM(EMUI 4.1.1 VNS-L21C432B160) after hours of searching I gave up on the oeminfo or rooting the phone. I searched for the stock firmware and found some rollback packages on the Huawei site. I will post the links in there you even have instructions packed with the zip.
LINK1
LINK2
Download both start with the smaller one because it's flashing first and follow the instructions in the pdf. Worked for me so hope it also helps you.
Also as I found out just now this rollback also locks back your bootloader so be sure to unlock it back again with the code.
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 all you confused people!
I was at the same situation myself without having a backup after i bricked my honor 8.
I looked everywhere but i couldn't seem to find the latest firmware with a simple and easy instalition guide.
Basically all you have to do is flash the old rom version and then update your phone through HiSuite.
Things you are going to need:
A SDCard
Your device
The firmware of your region which you are going to get through the post i will link. Thanks a lot @DigiGoon
And last your pc with hisuite installed.
1)So download the firmware according to your device.
2)unzip it and you will have a folder named "dload"
3)take the folder with its contents and paste it to your SDCard
4)place the sdcard to your phone
5)Power your phone off if it isn't powered of already
6)press the volume up and down button and then press the power button(all at the same time!!!)
7)the phone will install the update package(firmware)by itself.after that its going to reboot
8)Then connect your phone with the computer and press update on Hisuite.it will download and install a full update.
9)after that update from the phones ota and you succesfully have your device like brand new out of the box.
if this helped you in any way press thanks if you are kind enough
thanks to @DigiGoon again for providing the firmware,feel free to ask me anything in the comments.
GerasxD said:
Hello all you confused people!
I was at the same situation myself without having a backup after i bricked my honor 8.
I looked everywhere but i couldn't seem to find the latest firmware with a simple and easy instalition guide.
Basically all you have to do is flash the old rom version and then update your phone through HiSuite.
Things you are going to need:
A SDCard
Your device
The firmware of your region which you are going to get through the post i will link. Thanks a lot @DigiGoon
And last your pc with hisuite installed.
1)So download the firmware according to your device.
2)unzip it and you will have a folder named "dload"
3)take the folder with its contents and paste it to your SDCard
4)place the sdcard to your phone
5)Power your phone off if it isn't powered of already
6)press the volume up and down button and then press the power button(all at the same time!!!)
7)the phone will install the update package(firmware)by itself.after that its going to reboot
8)Then connect your phone with the computer and press update on Hisuite.it will download and install a full update.
9)after that update from the phones ota and you succesfully have your device like brand new out of the box.
if this helped you in any way press thanks if you are kind enough
thanks to @DigiGoon again for providing the firmware,feel free to ask me anything in the comments.
Click to expand...
Click to collapse
Will this work on an unlocked bootloader?
h4cker90 said:
Will this work on an unlocked bootloader?
Click to expand...
Click to collapse
Yes, installation via dload method will work with locked bl and will likely relock your bootloader. And it's better to make a factory reset through recovery after installation and boot it up once before you update in next step.
About update via HiSuite, idk if this needs a locked BL.
Sent from my FRD-L09 using XDA Labs
Can I use this to update to EMUI 8 on FRD L04?
Blackherted said:
Can I use this to update to EMUI 8 on FRD L04?
Click to expand...
Click to collapse
yes you can do it in any firmware you are currently.
can i use this methode when i have a coustom recovery and an open bootloader?
I have android 6.0 and i want to install Oreo and later on rros.
Or is there a easier version to install oreo? Because my phone isnt bricked.
Palindrom87 said:
can i use this methode when i have a coustom recovery and an open bootloader?
I have android 6.0 and i want to install Oreo and later on rros.
Or is there a easier version to install oreo? Because my phone isnt bricked.
Click to expand...
Click to collapse
You'd be able to update to nougat, go to B412, update to Oreo via HiSuite and than flash RROS. All these passages surely will delete all your datas and lock your device back.
Hello there,
Thanks for the guide but where is the link to the firmwares?
I'm on the latest Oreo with unlocked bootloader and I wish to do that to relock my bootloader...
I tried this guide but doesnt work for me.. Once i reboot with three finger, after reach 5% recovery say me update failed
Inviato dal mio ONEPLUS A3003 utilizzando Tapatalk
Please help
Thanks help, my honor 8 frd-l09 broke down, constantly lost signal from network operator, so I bought on eBay a board supposedly would be the same but the seller lied, the board had Chinese firmware, after searching here on the site I followed a tutorial to rebrand from frd-al00 to frd-l09, everything was perfect, until updates started to arrive on the phone and I accepted, the third update occurred an error and the phone no longer started, to make it worse i tried to install another rom Now I have a brick.
Hello, it is my first post on this forum and it of course has to be problem. I am not expert in mobile phone hacking/flashing and this issue is too big for me to handle.
So like 6 hours ago i had working p8lite L21 with official android 6.0 and locked bootloader. I really wanted install costum rom due to performance issue, so i downgrade it back to 5.0 lolipop, than I root it with kingroot and successful extract key and unlock it using this tutorial: https://forum.xda-developers.com/newthread.php?do=newthread&f=4627
Than I flash recovery and install TWRP 3.0.2-0 and it all just worked. I was so happy that i manage to pull this off and I forgot that now i have EMUI 3.1 (ALE-L21C432B170) and i flashed phone with this:
https://forum.xda-developers.com/p8lite/development/rom-lineageos-14-1-p8-lite-t3824247
Of course it bricked because I missed that part with special version of TWRP. After that i tried to install something older just to get phone to work again:
https://forum.xda-developers.com/p8lite/development/rom-cyanogenmod-13-0-ale-l21-t3708835
And surprise, surprise, it did not work either and now I am stuck with huawei boot logo.
I did some research how to fix this issue, but i found so many different problems and solutions, I thought that at this point I really should ask for help because I just have no idea what i am doing now At this stage, can i just flash some costum rom (idc what exactly, just wanna to be lightweight) or i have to somehow restore original firmware? And if so how to do it? As i mentioned, i had access to TWRP.
Thanks a lot for your help in advance.
can someone help me with unbricking this phone? ?
@edit ok nevermind, i thought that this phone is cheap anyways so why not risk and just flashed boot/recovery/system from stock rom with fastboot. I did it and it works again, i needed just this simple hint to do it but i guess p8lite forum is dead.
ChuZZZta said:
Hello, it is my first post on this forum and it of course has to be problem. I am not expert in mobile phone hacking/flashing and this issue is too big for me to handle.
So like 6 hours ago i had working p8lite L21 with official android 6.0 and locked bootloader. I really wanted install costum rom due to performance issue, so i downgrade it back to 5.0 lolipop, than I root it with kingroot and successful extract key and unlock it using this tutorial: https://forum.xda-developers.com/newthread.php?do=newthread&f=4627
Than I flash recovery and install TWRP 3.0.2-0 and it all just worked. I was so happy that i manage to pull this off and I forgot that now i have EMUI 3.1 (ALE-L21C432B170) and i flashed phone with this:
https://forum.xda-developers.com/p8lite/development/rom-lineageos-14-1-p8-lite-t3824247
Of course it bricked because I missed that part with special version of TWRP. After that i tried to install something older just to get phone to work again:
https://forum.xda-developers.com/p8lite/development/rom-cyanogenmod-13-0-ale-l21-t3708835
And surprise, surprise, it did not work either and now I am stuck with huawei boot logo.
I did some research how to fix this issue, but i found so many different problems and solutions, I thought that at this point I really should ask for help because I just have no idea what i am doing now At this stage, can i just flash some costum rom (idc what exactly, just wanna to be lightweight) or i have to somehow restore original firmware? And if so how to do it? As i mentioned, i had access to TWRP.
Thanks a lot for your help in advance.
Click to expand...
Click to collapse
Can you access TWRP or fastboot mode?? Yes, the thread has been quite inactive... it used to be totally different few years back...
amageek said:
Can you access TWRP or fastboot mode?? Yes, the thread has been quite inactive... it used to be totally different few years back...
Click to expand...
Click to collapse
Yea, i had access to twrp and fastboot. I already fixed it by flashing stock rom with fastboot. But maybe you can help me with other issue, currently i have android 5.0.1 emui 3.1 build c432b170 and i wanna install this rom:
https://forum.xda-developers.com/p8lite/development/rom-lineageos-14-1-p8-lite-t3824247
as i understand i need to have android 7.0 with emui 4.1, install costum twrp and than flash this rom. But how to update this phone to android 7.0? When i check for updates it says that there is nothing to update
ChuZZZta said:
Yea, i had access to twrp and fastboot. I already fixed it by flashing stock rom with fastboot. But maybe you can help me with other issue, currently i have android 5.0.1 emui 3.1 build c432b170 and i wanna install this rom:
https://forum.xda-developers.com/p8lite/development/rom-lineageos-14-1-p8-lite-t3824247
as i understand i need to have android 7.0 with emui 4.1, install costum twrp and than flash this rom. But how to update this phone to android 7.0? When i check for updates it says that there is nothing to update
Click to expand...
Click to collapse
I believe I can help you... Check the First Comment of that post... you'll see two additional firmwares... Only those firmwares have EMUI 4.1... b896 is for dual sim and b895 is for single sim... use any of those as per your requirements... after that download the LineageOS firmware and then proceed as per the Thread's recommended way... Also, before installing LineageOS, make sure you don't have any lockscreen lock...
feel free to ask if you have any more questions...
PS: i may reply bit late... maybe an hour, 5 hours or even days... but will try to check frequently..
amageek said:
PS: i may reply bit late... maybe an hour, 5 hours or even days... but will try to check frequently..
Click to expand...
Click to collapse
No worries, im happy that someone reply to me
So yea, i noticed those two softwares, i have two imei number so i picked b896 version for dual sim, but when i extract it and place in dload folder and try to update it via holding power button + -, i get software installation failed message. So I am not rly sure how to install this firmware, do i have to extract update.app and flash recovery/boot/system with fastboot, or i need to install it using some twrp? I look for guide but everyone are using this powerbutt + - methode to do this
ChuZZZta said:
No worries, im happy that someone reply to me
So yea, i noticed those two softwares, i have two imei number so i picked b896 version for dual sim, but when i extract it and place in dload folder and try to update it via holding power button + -, i get software installation failed message. So I am not rly sure how to install this firmware, do i have to extract update.app and flash recovery/boot/system with fastboot, or i need to install it using some twrp? I look for guide but everyone are using this powerbutt + - methode to do this
Click to expand...
Click to collapse
Do you mean Vol +, Vol - and Power Button by powerbutton +- ? That's one way of flashing it, if you get error by that method, try it once again. If it doesn't work at all, then yes extract the update.app and go for the hard way...
amageek said:
Do you mean Vol +, Vol - and Power Button by powerbutton +- ? That's one way of flashing it, if you get error by that method, try it once again. If it doesn't work at all, then yes extract the update.app and go for the hard way...
Click to expand...
Click to collapse
Yea, i mean that i holding all three buttons (power vol+ vol-) and than it just says that installation failed. To flash it with fastboot i need to just flash recovery/boot/system or more files? I am asking because currently i have android 5 and this firmware is android 7 and I am just not sure if i can just simply flash those files and it will works.
Thanks for helping me
ChuZZZta said:
Yea, i mean that i holding all three buttons (power vol+ vol-) and than it just says that installation failed. To flash it with fastboot i need to just flash recovery/boot/system or more files? I am asking because currently i have android 5 and this firmware is android 7 and I am just not sure if i can just simply flash those files and it will works.
Thanks for helping me
Click to expand...
Click to collapse
Which one are you trying to flash??? b896?? or simply LineageOS??
If it's b896, then I did read that it can only be flashed on ALE-L21C02xxx, but i am unsure about it... I did installed LineageOS and Resurrection Remix back in the days but I don't think I ever used C02 ROM for B896...
Also if you have the latest TWRP, you can simply flash with it... Try it...
Here's the link for tutorial
Hello,
Recently a Huawei P9 lite VNS-L21 came into my hands. I experimented a bit with unofficial ROMs but eventually flashed the official back. I had flashed an earlier version, ending in 380 I believe, but because the phone attempted to upgrade to the next incremental update (say, -382) I decided to upgrade myself to the latest supported version (506). I used Firmware Finder to find the firmware and downloaded it to SD card.
Upgrade succeeded - since I had left TWRP recovery in the phone, I used the HuRUpdater which worked flawlessly.
The only small issue is that following this update, a red message is displayed on boot saying the device has failed verification.
Any way to solve this?
Sovjohn said:
Hello,
Recently a Huawei P9 lite VNS-L21 came into my hands. I experimented a bit with unofficial ROMs but eventually flashed the official back. I had flashed an earlier version, ending in 380 I believe, but because the phone attempted to upgrade to the next incremental update (say, -382) I decided to upgrade myself to the latest supported version (506). I used Firmware Finder to find the firmware and downloaded it to SD card.
Upgrade succeeded - since I had left TWRP recovery in the phone, I used the HuRUpdater which worked flawlessly.
The only small issue is that following this update, a red message is displayed on boot saying the device has failed verification.
Any way to solve this?
Click to expand...
Click to collapse
Hello,
my doubt is that you flashed a different firmware version from the one you had, thus corrupting the device's oem file. Could you post which was the latest complete firmware without this problem and the last one you downloaded and flashed? ( ex. L21CxxxB382 & LxxCxxxB506 ).
Let me know this info ...
Hi,
I went from l21c432b380 to l21c432b506 during this process. Stock OEM file was flashed before the -380 upgrade (no errors existed, the 380 upgrade followed a flash of -370).
I'm not sure why this is happening - I mean, both firmwares were from the firmware finder app... Weird, to say the least.
Sovjohn said:
Hi,
I went from l21c432b380 to l21c432b506 during this process. Stock OEM file was flashed before the -380 upgrade (no errors existed, the 380 upgrade followed a flash of -370).
I'm not sure why this is happening - I mean, both firmwares were from the firmware finder app... Weird, to say the least.
Click to expand...
Click to collapse
Yep, you used correct file but anyhow the firmware has been corrupted.
I think you have some ways to solve...
1 - if you have stock recovery, reboot into it and
download and flash the same latest firmware.
If you do not have it, you can extract (with huawei update extractor) it
(should be recovery1.img) from B506 firmware (update.zip) you already got,
then can be flashed via fastboot commands.
2 - Flash a previous or B380 firmware via HuRUpdater, then
update to latest via Firmware Finder with dns/vpn method.
3 - Repeat the whole job you done with B506 firmware. (via HuRupdater)
4 - Reboot recovery, reflash L21OEMinfo file, dual sim one, then the latest firmware again...
P.S.: method 1, 2, 4 will re-lock the bootloader, no problem if still you got the code...
Beware method 4, after you flash the oeminfo file do not shout down, reboot to bootloader
and unlock it again with the code. Device will reboot into twrp, then flash B506 firmware.
Good luck and let the community know..