Can i downgrade from Oreo to Nougat 100% accurately without any error!!! - Android Q&A, Help & Troubleshooting

hello there to all experts,
I read a lot and did not find 100% satisfactorily answer anywhere about downgrading android from Oreo to nougat via flashing Nougat firmware with help of SP Flash Tool.
Actually i have lenovo k8 Plus 3 GB variant. Unfortunately i upgraded it to Oreo vi OTA update but after that facing a lot problems. I have done flash while once i stuck in boot loop in nougat so i have all working firmware and drivers and sp flash tool too.
but when i looked in videos on you-tube and comment of users 99/100 told that their phone did not boot after flashing firmware and to make phone working again they had to flash Oreo again. some experts told that oreo support project treble so partition scheme has lil bit changed. some user says its boot loader is different and tht's y device did not turn on after downgrade. some says firmware should be of binary 2 boot-loader.
In short m not getting perfect technical answer . is there any technical reason behind downgrading Oreo to nougat or i can do it.
plz make it clear.:silly:

First reason couldn't be correct. because, project treble hasn't enabled even after Oreo update.

Related

[Stock ROM] [Discussion] [ Lenovo k6 / k6 power] [Karate] [k33]

This thread to discuss about stock ROM for lenovo k6 / k6 power karate k33 device.
K6 / k6 power comes up with stock Marshmallow build (s150) which is being updated to s156 marshmallow buiild. It has stock s222 & s223 Nougat stock build which is being updated to s227.
Kindly ask questions about stock ROMs issues here.
Kindly share things related to stock ROMs here.

			
				
I'm on stock Nougat, version S223. Not rooted nor unlocked. And I have not received the S227 OTA update till now. Which K6 model you are using?
moinkhan0137 said:
I'm on stock Nougat, version S223. Not rooted nor unlocked. And I have not received the S227 OTA update till now. Which K6 model you are using?
Click to expand...
Click to collapse
I have a K6 (without Power/Note) K33a48_DS and also received the K33_S227_170801_ROW update. Android 7.0 Patch Level 1st July 2017.
moinkhan0137 said:
I'm on stock Nougat, version S223. Not rooted nor unlocked. And I have not received the S227 OTA update till now. Which K6 model you are using?
Click to expand...
Click to collapse
S227 will work in all varients of karate/k33xx
kfkea said:
I have a K6 (without Power/Note) K33a48_DS and also received the K33_S227_170801_ROW update. Android 7.0 Patch Level 1st July 2017.
Click to expand...
Click to collapse
Are the lags and other bugs fixed in this update??
moinkhan0137 said:
Are the lags and other bugs fixed in this update??
Click to expand...
Click to collapse
You try yourself. Idk.
S227
Well idk its just security patch or bug fixing update but bloat app resinstallion automatically is gone .i have bought device 4 days back.so cant tell goods bads so early but no mic issue i faced .Yes volume in call nd video recording is little low compared to other device but its tolerable.
No Hanging Or heating issue i faced .Just little lags still ther but not like it was when i first updated Nougat.It took 2:30 hr Charge time for 0 to 100% nd 9-11hr SOT i got in my usage.
*** To my surprise "Vilte" worked Video call over data i mean i turn off data nd tried to video call my friend who own RN4 nd it worked." Plz confirm others too abt this feature.
Network issue still ther i mean data freezes sometimes but turn om turm off process solve it instantly.Overall i will say update has fixed something but its my assumption as i owm device from just 3 days nd from first day i got 10/6/2017 build nougat update nd then manually updated to 1/8/2017 by these Awesome Devs help.
Thank u .
bug
I have a problem in my k6 that the brightness when it is set at the maximum when I play games 1 minute it goes down alone but it is not set to automatic it seems that it is temperature. would any solution to the brightness not vary when set to maximum in stock rom ?
Stock Nougat updated
Yesterday I flashed the Nougat firmware version - S223 on my bootloader locked and non-rooted K6 Power and got update S229. It's almost like S227.. security patch 1st July, reset apps on reboot bug resolved and little bit improvement in performance. nothing else.
any way to port other stock rom can run in our lenovo like asus as example
i am in stock rom , my second sim is not working and the headphone volume is too low. this happened when i reverted back from custom rom
nougat stock rom download
Friends,
After a little accident i had to flash my phone but I didn't found stock rom for my k33a48 model.
Could, please, someone tell me where i can find it or someone could create a dump where I can use it to flash.
tks.
Marshmallow stock rom
Where can i get twrp flashable marshmallow stock rom for lenovo k6 power and giude to revert back to stock rom...coz getting many errors while flashing rom via qfil.
hello i lost volte option in my lenovo k6 power,how to recover that
Facing problems...
Today i decided to change the rom. So i tried to boot to twrp and that's where i faced the first issue. I cannot get into twrp . When i press all the keys it takes me to fastboot mode. Few days ago i removed supersu completely so the twrp got removed. But later i tried to reinstall it. It successfully got installed so left it and rebooted my phone and it worked fine. Today i tried to get into twrp but it went into fastboot mode so again i installed twrp and tried to install resurruction remix version 5.8.5 and it shows me updater process ended with error 255 .So i installed 64bit twrp then i tried to install the same rom but again came the same error. So i tried to install resurrection remix version 5.8.3 and a new error 7 and it shows this package is for karate and this device is k33a48 but i damn sure my device is k33a42. plzz help .also i cannot switch off my device.
adityan1504 said:
Today i decided to change the rom. So i tried to boot to twrp and that's where i faced the first issue. I cannot get into twrp . When i press all the keys it takes me to fastboot mode. Few days ago i removed supersu completely so the twrp got removed. But later i tried to reinstall it. It successfully got installed so left it and rebooted my phone and it worked fine. Today i tried to get into twrp but it went into fastboot mode so again i installed twrp and tried to install resurruction remix version 5.8.5 and it shows me updater process ended with error 255 .So i installed 64bit twrp then i tried to install the same rom but again came the same error. So i tried to install resurrection remix version 5.8.3 and a new error 7 and it shows this package is for karate and this device is k33a48 but i damn sure my device is k33a42. plzz help .also i cannot switch off my device.
Click to expand...
Click to collapse
2 months ago i've had allmost the same issues on my K6 Note ,i think the problem is with the TWRP recovery ,that you have,download the latest twrp for karate fom the official twrp site,i think is 3.1.1 ,for the error code 7 ,there is no problem with your phone,the problem is with the custom rom,you will have to unzip the rom,open one file with notepad and delete some of the first columns.You can find video tutorials about error code 7 in the web,it is very easy to fix.I hope I've helped.The problem with turning off the phone comes from the recovery,because she patches the boot.img . After reinstalling with the right recovery,you won't have any problems switching off the phone
Greetings,
where can we download stock ROMs?
Thank you!
Link me the official original firmware of lenovo k6 power k33a42 marshmallow build
Flashed
Lenovo_K33a42_S223_Q00440_20170610 via QFIL
Got OTA update K33_S223_170610_ROW_TO_K33_S229_170908_ROW of 76mb
after update again got another one
K33_S229_170908_ROW_TO_K33_S231_17114_ROW
79MB
this was the last update I received through OTA.
I suppose this is the latest stable stock build ppl should be on before flashing custom ROM?
The last update causes touch lag issues on this unit of lenovo k6 power. it's nothing like it was just moment ago before on the previous 2 updates. I haven't touched anything else on this device. does anyone noticed this with last OTA update which is on November 1, 2017 patch?

J701f/ds jtnxt touch not working in 9.0 cant downgrade.

hey guys kindly help as the touch of my phone is not working after i updated to the pie os. now that i can't also downgrade to any official rom, as the binary is 8. when i use every other combination file provided on all of the internet i get back to 7.0 which i dont want to that is also not volte supported. what can i do now , i desperately want 9.0 or get back to 8.0.
i tried to install twrp which officially is not available for my phone when i try xda models the twrp becomes mirrored and everything on the screen comes flipped. plese help.
#sos

Downgrade from Android 10 to Android Oreo

Hey guys, I want to downgrade my S9 plus exynos variant from Android 8 to Android 10, because many people say camera processing was better on oreo as well as battery life.
I know some of you might disagree with me , but I wanna try it . Because trying never hurts , right ? ?
Please let me know how to do this , is it as easy as flashing through Odin ? Or there any complications of bootloader version restrictions ? If yes , any workarounds please.
Thanks you for reading this and helping me out.
you cannot downgrade back to Oreo 100%
Try flashing combination firmware for your model, and then flashing Oreo ROM on top of that.

Rolling back my LG V30 to Android 8 (Oreo)

I have an app that does not work after Android 8 that I need and there is no replacement in 9 or above. I managed to avoid updating my v30 to v9 and later for a year or so. It accidentally allowed the update to 9 this past weekend while I was camping. All I want to do is roll back to stock v8 or 8.1 (Oreo).
I have enough tech knowledge to follow directions and understand rooting but am having a really hard time finding the "right directions." As I was reading some of them, I found caveats like, "Use X unless you have the delta update and then use Y but not if you want to run Z. For Z, you have to follow this other thread." I also know that using the wrong settings or data file could brick the phone.
So, I'm hoping someone can help me narrow down what sets of directions I need to follow.
Here's what I have right now:
LG V30 (VS996) On Verizon Network
Developer Options Enabled
Android V9
Security Patch Level August 1, 2019
Kernel Version: 4.4.153
Build #: PKQ1.190414.001
Software version: VS99630c
Again, all I want to do is roll back to stock v8 or 8.1 (Oreo).
Bonus would also be a way to stop asking me every day to update or delay a day and just wait until I manually do it.
Thx in advance!!
Download the right firmware file for your device from here -
Models - LG-Firmwares.com
Free archive of LG firmwares. Comparison of features and reviews of all mobile devices. Quick download of updates for your device.
lg-firmwares.com
Then download the flash tool from here -
LG Flash Tool Free Download - Official Download Links
LGUP tool is the latest version of LG Flash Tool that allows users to flash stock firmware on LG smartphones and tablet devices. Download LG UP tool 2018 from the official download links.
lgflash.com
Follow the instructions on both the pages. I think you can take it from here.
Note that implied with this process is that you cannot downgrade your firmware without wiping the phone... there's no way to "patch" back to the old version. So, be sure to take backups FIRST.
If you're rooted on the old firmware, you can then disable/freeze/delete the update APKs so that the update warning goes away. But this requires root, so be aware of that. If you don't haven't rooted already, then this is a process of its own, and will require you to go back to Nougat in order to perform that, so you may want to do that before installing the final version of the ROM you want. You can find out how to do this rooting process on the WTF thread, post #193, located here: https://forum.xda-developers.com/t/...ar-instructions.3790500/page-10#post-76584629
If you don't want to root, that's fine, but then you must endure the update warning process... unless you can find another way to disable the update APKs.
Thank you both. I expected to wipe the phone so that's not an issue. I will first install Nougat, root and then update to Oreo.
There are about 14 Oreo ROMs on that site. Do I just pick the latest one or do I have to pick the earliest one and update that?
Pick the latest one.
VS99620k_02_0510_ARB00.kdz

Question Installing OxygenOS 13 DN2101 ROM on DN2103 model

Hi,
I found full stable Oxygen OS 13 ROM version F22 for DN2101. When I try local update on DN2103 I always get verification failed message.
Is there any way to install it without unlocking bootloader?
I dont wanna mess to much with the phone as I know there is no much support for Mediatek devices if I get hard brick.
Link for the ROM is in the video description on yt:
Hello, I have the same problem, I have dn2101 android 12.1 and it also fails in local installation, but when I want to unlock the bootloader and I enter recovery, I don't see the advanced option....
ped1609 said:
Hello, I have the same problem, I have dn2101 android 12.1 and it also fails in local installation, but when I want to unlock the bootloader and I enter recovery, I don't see the advanced option....
Click to expand...
Click to collapse
You cant unlock bootloader because oneplus blocked it for some reason on latest 12.1 update. I tried to roolback to Android 11 so I can flash EvoX Rom but also getting verification failed message.
cimbajunior said:
You cant unlock bootloader because oneplus blocked it for some reason on latest 12.1 update. I tried to roolback to Android 11 so I can flash EvoX Rom but also getting verification failed message.
Click to expand...
Click to collapse
Hello, yes, I went down to android 11 and unlocked the bootloader, but I closed it again, later I'll try maybe to install twrp and some gsi rom, well I just bought it and I don't want to bother her.

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