How to install Cyanogen on my stock M8? - One (M8) Q&A, Help & Troubleshooting

Hi,
I searched online for many hours but I can only find many mixed, outdated articles, videos.
I don't want to do something stupid so can someone tell me or show me a guide on how to install this?
I am newbie to this, so some kind of foolproof guide would be most appreciated.
1) do this
2) then do this
3) now do this
.
.
.
.
#) finally do this and you are running latest version of Cyanogen
The phone is stock, never rooted or anything. It is purchased in Denmark (Northern Europe), and is not associated to any company or carrier.
Android version 6.0
HTC Sence version 7.0
Softwareversion 6.12.401.4
Kernel: 3.4.0-perf-g708019f
Basebandversion 1.29.214500021.12g_20.72.4196t.01_F
Versionnumber
6.12.401.4CL662736 release-keys
If any more info is needed, let me know and I will provide it
Thanks a lot.

cmnielsen said:
Hi,
I searched online for many hours but I can only find many mixed, outdated articles, videos.
I don't want to do something stupid so can someone tell me or show me a guide on how to install this?
I am newbie to this, so some kind of foolproof guide would be most appreciated.
1) do this
2) then do this
3) now do this
.
.
.
.
#) finally do this and you are running latest version of Cyanogen
The phone is stock, never rooted or anything. It is purchased in Denmark (Northern Europe), and is not associated to any company or carrier.
Android version 6.0
HTC Sence version 7.0
Softwareversion 6.12.401.4
Kernel: 3.4.0-perf-g708019f
Basebandversion 1.29.214500021.12g_20.72.4196t.01_F
Versionnumber
6.12.401.4CL662736 release-keys
If any more info is needed, let me know and I will provide it
Thanks a lot.
Click to expand...
Click to collapse
You must Unlockbootloader and flash TWRP to install Cyanogenmod

The general steps:
1) Backup any important personal data before you start, off the phone.
2) Unlock bootloader via HTCDev.com, and flash TWRP custom recovery. There is a step by step guide here. For flashing CM, you only need to do Sections 0 and 1 (and don't need to root as described at end of Section 1). While the guide is a bit dated, Sections 0 and 1 are still relevant, with the exception that that you need to use an updated version of TWRP 3.0 found here: https://dl.twrp.me/m8/
Also the command to flash TWRP (somewhat obviously) needs to contain that same updated TWRP version name/number.
3) Put the desired ROM and Google Apps (gapps) on the phone or SD card.
4) Boot into TWRP. Make a TWRP backup (nandroid) of your current ROM and setup in the TWRP "Backup" section.
5) Go to TWRP "Wipe" section and do the default wipe (don't go into Advanced section unless someone specifically tells you to).
6) Go to TWRP "Install" section, browse to the desire (CM) ROM, and install it. Also flash the desire gapps package.
7) Reboot and setup the phone. The first boot will probably remain on the boot splash screen for a good 10 minutes, than maybe 5-10 minutes more optimizing apps.
8) Drink beer

Related

[Q] Please help instal Recovery

.
UPDATE: Ok I done a lot more reading. This looks like the way to go ?
With my current phone ( See Bellow ) this method will be ok to get me Rooted and Recovery installed ?
http://forum.xda-developers.com/showpost.php?p=39258099&postcount=1
Yes ..?
Thank you for replies !!
.
=================================================
Hi -
I am sorry if this question bothers some ... but I have looked around (searched) for a day or 2 and learning the do's and don'ts
of Rooting / Installing Recovery / Flashing ROM's for THIS phone (my 5th Android phone). I am pretty familiar with rooting and
running custom recoveries flashing roms and kernels and even a little coding (very little) on many phones and tabs over the past
couple years. But this is a new phone for me. I have used the search forum button, but I keep getting different solutions , or they
are very old and I am not sure they still apply to this phone running 4.0.4
My phone is 2nd hand, but never been rooted. It is 100% stock. It is running fine with my SIM and everything works ... but I need
to ROOT and instal RECOVERY so I can run custom ROM asap. Please help or point me to the correct location to....
Install a RECOVERY (either CWM or TWRP (prefer twrp))
ROOT the phone
Start flashing custom ROMS and Kernels :laugh: (this one I know how)
I see some program called "Odin" but I have never used a PC app to root my stuff in the past ... so yeah I am confused
PLEASE Help me at least with #1 ( Installing recovery ) and #2 ( Get Root )
========================================================
Here is exactly what I got.
PHONE: Samsung Galaxy S II ( T-MOBILE VERSION )
MODEL: SGH-T989
ANDROID: 4.0.4
BASEBAND: T989UVLI4
KERNEL: 3.0.8-perf-1190554 [email protected] #1
BUILD: IMM76D.UVLI4
SD-Card: 32 Gig's
=======================================================
Currently I am running a heavily modded MIUI on a T-Mobile LG G2x P999 and I run Windows 7 Ultimate on my PC.
*Note* I DO NOT CARE if I lose anything that is currently on this new Galaxy phone.
Thank you for at the very lest reading this far !! I ramble on a lot I know. I am looking forward to some helpful replies :fingers-crossed:
Thibor
__________________
.
That guide will walk you through everything you need to do. Set aside an hour (and a stiff drink) to get through everything. Odin is VIRTUALLY foolproof, don't worry. Like it says the .zip has all you need, I've used it 3 times. I would recommend updating twrp to the latest version when you are done. (2.5.5.0 I think) goo manager is probably the easiest way. Good luck!
T989D
latest CM10.1 nightly
latest Uber nightly

Verizon Unlock/Root Survey

I thought I'd put together a basic survey to possibly help others with their Unlocking/rooting questions.
Please only answer if you have successfully completed the steps and have your bootloader unlocked and phone rooted based on information provided by THIS thread. If you don't currently own a Verizon Retail Note 4, respectfully, PLEASE DO NOT post a reply. Thank you.
If you reply, it is assumed that you have completed the process and have successfully turned your Retail Phone into a Developer Phone. If you are still "tinkering" with your phone after the conversion process, feel free to reply and update your reply as needed, to help others.
Before you began:
Your Android Version?
Your build number?
Did you Odin or Flash to get the above Build Number?
What version of KingRoot did you use to Temp Root your phone?
After Converting to Developer Mode/Rooting (Some questions - If Applicable):
SINCE converting, what Android Version/Build Number have you upgraded from/to? Was the upgrade via OTA or Odin?
What confirmed working root apps are you running (other than Root Checker)?
What have you installed onto your phone that requires an unlocked bootloader that are confirmed to be working?
Has this process changed (made better or worse) how your phone reads extended batteries? State which external batteries you have tested, since the root process was made available this week.
Here's my experience.
STARTED WITH:
Your Android Version? 5.0.1
Your build number? BOG5 Safe Upgrade
DOWNGRADED TO (Because I thought I had to which might've been a mistake)
Your Android Version? 4.4.4
Your build number? ANJ5
Flashed via Odin 3.10.7
Results: After starting the HOWTO Guide on converting from Retail to Developer Mode, I got stuck on THIS step, which gave me an error message
Code:
./samsung_unlock_n4-2
Later, I was told that others had reported issues trying to convert from KK. I then took the Safe Upgrade to BP1. Be sure that you are installing the RETAIL version of the ROM, not the Developer Version. You are not there, yet.
Once you are on BP1, download eMMC Brickbug Check from the Play Store. Verify that your CID begins with 15 followed by a bunch of random numbers. Then, follow the steps on the HOWTO Guide on converting your Retail phone to Developer.
After you do this:
Boot to Download Mode (VOLUME DOWN+HOME+POWER) and flash TWRP 2.8.5 recovery via Odin
If you haven't, already, get your MicroSD card, plug it into your computer and load SuperUser and the kernel (see this reply) onto it. Put it back into your phone
Boot to TWRP recovery (VOLUME UP+HOME+POWER)
Install the two files you just loaded
I this point in time, you SHOULD have BPA, Developer Mode AND root.
With that said........
Your Android Version? 5.0.1
Your build number? BP1
Flashed via Odin 3.10.7
What version of KingRoot did you use to Temp Root your phone? KingRoot 4.8.5
Rather than answer my own questions, I'll just state what so far does work that I've tried:
I've installed CM13 via TWRP. I currently do not have root, but that's about to change.
Before you began:
4.4.4
ANJ5
Don't remember
4.8.5
After rooting:
(If applicable) Have you taken an OTA or Flashed via Odin to a more updated build number? If so, what build number?
Upgrade to 5.0.1 N910VVRU2BOG5_StockRestore.tar.md5 using Odin.
Followed directions to unlock Developer mode.
Flashed N910VVRU2BPA1_StockRestore.tar.md5 to get 5.1.1 through Odin.
Reflashed TWRP and rebooted.
copied MultiSystem-Kernel_LP-5.1.1.zip, BETA-SuperSU-v2.67-20160203160253-TruncatedBoot-Fix.zip, and xposed-v75-sdk21-arm-arter97-snapdragon.zip to phone and flashed them through TWRP. Wiped cache and Davlik cache. Rebooted.
(If applicable) What confirmed working root apps are you running (other than Root Checker)?
Titanium Backup, SD Maid, Xposed Framework, TWRP Manager, Call Recorder, BusyBox Free.
(If applicable) What have you installed onto your phone that requires an unlocked bootloader that are confirmed to be working?
You couldn't install TWRP without an unlocked bootloader, so...
(If applicable) Has this process changed (made better or worse) how your phone reads extended batteries? State which external batteries you have tested, since the root process was made available this week.
Haven't tested yet, but I think the MultiSystem-Kernel_LP-5.1.1.zip and screen auto brightness settings are draining battery less. Too soon to tell.

How to downgrade to kitkat or lollipop from any higher android operating system

Hi Guys,
I am back with another thread for people who want to downgrade their Android ROM for different reasons from any higher android version, like some of you getting problem with new O.S, some of you might not like the new O.S and as in my case my new o.s marshmallow got crashed/currupted.
As in my case when my new updated O.S 6.0 Marshmallow got crashed, then no way was left to me but to reinstall 6.0 M on my phone, but as stock ROM of marshmalow for HTC Desire 816 dual sim A5_dwg indian version was not available on any portal online, so i need to rollback to any lower version android like kitkat or lollipop.
As you guys must know that if your phone is running on higher android O.S then it doesn't matter whether its corrupted or showing errors, you can't rollback/downgrade to any lower version android.
For finding way to get out of this problem, i am sharing some steps which i followed to rollback my phone to lower android version.
Step 1: First of all please make ready your computer by installing ADB drivers, fastboot utility and drivers for your phone.
Step 2: As i have already made clear that you can't roll back to lower android version from higher one so for doing that you need to unlock your phone's bootloader , ROOT your phone by following this thread
http://forum.xda-developers.com/showthread.php?t=2775801 and install any custom recovery available like CWM or TWRP, i personally prefer TWRP.
IMPORTANT Note: For users who have rooted and un-rooted their phones in past, updated stock ROM to any new stock version and already having Unlock_code.bin file on their e-mail, don't try to use that file now again for unlocking your phones bootloader as it will not work, you need regenerate that unlock_code.bin file from HTC website because with updated stock ROM, code for unlocking bootloader also changes.
Step 3: Once you are done with Rooting and installing custom recovery and Super user app. now it's time to install any custom ROM like cynogenmod or any other custom rom available for you phone. For downloading and installing CM 13 follow links given https://download.cyanogenmod.org/?device=a5dwg
https://wiki.cyanogenmod.org/w/Install_CM_for_a5dwg
Step 4: Once you are done with installing custom ROM CM 13 on your phone now you can start procedure to Un-Root your phone, install stock recovery and flash any lower android version stock ROM on your phone.
for unrooting and rolling back to stock rom you can follow my thread
http://forum.xda-developers.com/desire-816/help/how-to-unroot-roll-to-stock-htc-desire-t3487894
and
http://forum.xda-developers.com/desire-816/help/guide-how-to-flash-stock-recovery-ruu-t3308502
Wollah....... you are now ready with lower android version ROM on your phone and now you can update your phone O.S with OTA updates released by your phones manufacturer.

Hard Resetting A Rooted HTC One M8(5.0.1) Or Upgrading to 6.0 or 7.0

Hello everyone
i am new to XDA Developers and some googling regarding my HTC One m8 lead me to this forum.
I Have Htc one M8 which is rooted(Confirmed with Root Checker And It Say 'Congrats. Root Access Is Properly Installed On This Device' HTC One m8 Android 5.0.1
Android 5.0.1
HTC Sense 6.0
Software #
4.21.512.4
HTC SKD API Level
6.55
Kernal Version
3.4.0-gda51a6a
[email protected] #1
SMP PREEMPT
Baseband Version
1.14.20.0930
Build Number
4.21.512.4 CL470008 release-keys
My Query Is..
1. how can i hard reset my htc one m8 successfully. i hear horror stories many as people try to do factory reset from 'settings' > backup and reset and phone end up resetting into bootloop mode..similar stories i hear when rooted phones are resetted using bootloader .. please advice how to make through it successfully. didnt had any backup phone so i better ask experts rather than trying it and making trouble later.. phone is slow (hangs or stuck now and there) and had loud speaker not working so resetting might solve lagging issue (atleast for now)
2. i cannot see any "software update" option in settings maybe due to rooted or custom rom maybe...i dont know but if if i want to upgrade it to android 6.0 or 7.0 and is there any update available.. what procedure i need to follow . is it doable and safe to try or should i leave it as it is and just reset it?? please refer to procedure or explain..
one thing i need to mention
when i press pwr button..there's restart option which shows and in that....i got 5 options
1 reboot
2. hot reboot
3.bootloader
4.recovery
5safe mode
so this might help me doing it quickly??? or help me upgrade custom ROM
any quick help would be highly appreciated i am newbie to all this android thing(rooting , custom rom etc)
TIA
Farrukh
Anyone....Waiting for any help
sp20v said:
Hello everyone
i am new to XDA Developers and some googling regarding my HTC One m8 lead me to this forum.
I Have Htc one M8 which is rooted(Confirmed with Root Checker And It Say 'Congrats. Root Access Is Properly Installed On This Device' HTC One m8 Android 5.0.1
Android 5.0.1
HTC Sense 6.0
Software #
4.21.512.4
HTC SKD API Level
6.55
Kernal Version
3.4.0-gda51a6a
[email protected] #1
SMP PREEMPT
Baseband Version
1.14.20.0930
Build Number
4.21.512.4 CL470008 release-keys
My Query Is..
1. how can i hard reset my htc one m8 successfully. i hear horror stories many as people try to do factory reset from 'settings' > backup and reset and phone end up resetting into bootloop mode..similar stories i hear when rooted phones are resetted using bootloader .. please advice how to make through it successfully. didnt had any backup phone so i better ask experts rather than trying it and making trouble later.. phone is slow (hangs or stuck now and there) and had loud speaker not working so resetting might solve lagging issue (atleast for now)
2. i cannot see any "software update" option in settings maybe due to rooted or custom rom maybe...i dont know but if if i want to upgrade it to android 6.0 or 7.0 and is there any update available.. what procedure i need to follow . is it doable and safe to try or should i leave it as it is and just reset it?? please refer to procedure or explain..
one thing i need to mention
when i press pwr button..there's restart option which shows and in that....i got 5 options
1 reboot
2. hot reboot
3.bootloader
4.recovery
5safe mode
so this might help me doing it quickly??? or help me upgrade custom ROM
any quick help would be highly appreciated i am newbie to all this android thing(rooting , custom rom etc)
TIA
Farrukh
Click to expand...
Click to collapse
Hi, to make a backup of app, sms and calls, I can suggest you Titanium backup.
To save photos in DCIM directory or other files (i.e. in Pictures, Download, Whatsapp database and photos and movies...) you have to enable Developer option menu (search here and you'll find how to),
enable the USB debug and then you can transfer files from your phone to your PC as if it was a USB memory.
Then you can press Power button and Volume Down, then choose bootloader and then factory reset: in this way you will erase the datas you have in your phone but also SuperSU.
Then reboot and configure again the phone: go into settings menu and you'll be able to update to Android 6 via software update.
This way should work.
lordmago said:
Hi, to make a backup of app, sms and calls, I can suggest you Titanium backup.
To save photos in DCIM directory or other files (i.e. in Pictures, Download, Whatsapp database and photos and movies...) you have to enable Developer option menu (search here and you'll find how to),
enable the USB debug and then you can transfer files from your phone to your PC as if it was a USB memory.
Then you can press Power button and Volume Down, then choose bootloader and then factory reset: in this way you will erase the datas you have in your phone but also SuperSU.
Then reboot and configure again the phone: go into settings menu and you'll be able to update to Android 6 via software update.
This way should work.
Click to expand...
Click to collapse
Thanks But With Bootloader And Factory Reset...
Are You Sure It Will Erase Data And Wont Put Phone In Bootloop Or Anything..I Dont Have SuperSU On phone Though... No Idea How Its Rooted..
My Concern Is If Its Done Via Bootloader... It Will Boot Back To Stock Or I Will Also Remove Root .. I Heard People Doing Factory Resets Ending Up With Continuous boot-loop and cant boot back
i dont wanna take any risk but want to be 100% sure of procedure which will work..
backup is not an issue...already can connect phone with PC and can backup my pictures ...no such apps which i need to backup... only issue is phone should successfully reset with no problems faced
sp20v said:
Anyone....Waiting for any help
Click to expand...
Click to collapse
Your device with software version no. 4.21.512.4 is a rare device variant which is called LRA.
As far as I know, 4.21.512.4 is the last version for this device, there is no Marshmallow update ever release for LRA (Hopefully I'm wrong).
So to answer your questions :
Q1 - you can use RUU zip to fully reset the device including your internal storage data. You can find the RUU zip here - https://forum.xda-developers.com/showpost.php?p=66044439&postcount=37
It's best for you to expand that thread and read everything there (6 pages) to understand more about your M8 variant.
Q2 - Don't think there is any further update for your device. After using RUU above, you should have a full non-rooted stock LRA rom. You should find software update button to check any update available or not.
Before you do anything, post your device fastboot getvar all result to ensure you really have LRA 4.21.512.4 firmware, not only software.
lordmago said:
Then you can press Power button and Volume Down, then choose bootloader and then factory reset: in this way you will erase the datas you have in your phone but also SuperSU.
Then reboot and configure again the phone: go into settings menu and you'll be able to update to Android 6 via software update.
This way should work.
Click to expand...
Click to collapse
The above information is misleading, and some if it is false. Reason I say that is:
- Factory reset is a bit of a misnomer. All it does is wipe user data. It does NOT magically restore the system or kernel.
- The SuperSU app will be deleted, since apps are user data. But the root binary itself will remain after factory reset, since it consists of changes to the system/kernel. In short, root changes will remain, and the phone will still show as "software modified".
- Since the software is still modified, it will NOT allow update.
- The phone will likely not update anyway(even if the software was unmodified). Most US variants of this phone will not update unless connected to that actual US carrier (in this case LRA).
Best way to return to full stock, is by RUU as supplied by ckpv5 above.
---------- Post added at 11:11 AM ---------- Previous post was at 11:02 AM ----------
sp20v said:
Thanks But With Bootloader And Factory Reset...
Are You Sure It Will Erase Data And Wont Put Phone In Bootloop Or Anything..I Dont Have SuperSU On phone Though... No Idea How Its Rooted..
My Concern Is If Its Done Via Bootloader... It Will Boot Back To Stock Or I Will Also Remove Root .. I Heard People Doing Factory Resets Ending Up With Continuous boot-loop and cant boot back
Click to expand...
Click to collapse
Doesn't really matter whether it sends you to a bootloop or not; since (as I already described above) a factory reset does NOT remove root.
Root is on a system/kernel level. Nothing you do on the phone itself (without extra files) will "reset" it and unroot it. You must flash the stock software/ROM back to the phon in order to completely remove root.
My recommendation is to look at ckpv5's post above and follow his advice. He knows what he is talking about.
ckpv5 said:
Your device with software version no. 4.21.512.4 is a rare device variant which is called LRA.
As far as I know, 4.21.512.4 is the last version for this device, there is no Marshmallow update ever release for LRA (Hopefully I'm wrong).
So to answer your questions :
Q1 - you can use RUU zip to fully reset the device including your internal storage data. You can find the RUU zip here - https://forum.xda-developers.com/showpost.php?p=66044439&postcount=37
It's best for you to expand that thread and read everything there (6 pages) to understand more about your M8 variant.
Q2 - Don't think there is any further update for your device. After using RUU above, you should have a full non-rooted stock LRA rom. You should find software update button to check any update available or not.
Before you do anything, post your device fastboot getvar all result to ensure you really have LRA 4.21.512.4 firmware, not only software.
Click to expand...
Click to collapse
Dear Friend
Thanks for help. i already had gone through all that forums You Posted Earlier on about LRA M8 and yup mine was M8 LRA
The Link Mentioned above was already downloaded and full RUU was finally flashed last sunday it was success.. yes you are correct after Flashing it was 4.12.512.4 and upon checking update it upgraded to 4.12.512.5 Only
Have To Change CID To Get Update Installed...user on that forum asked and you mentioned to change CID and It Worked for me also.. CID changed to LRA_001
After 4.12.512.5 There's No Update Available Now ..But With This RUU i Guess phone is back to all stock ... Later I Did TWRP recovery part also as mentioned on that forum But Didn't Go Further Than That As Custom ROM Is Now I Guess Only Way To Upgrade To M.M Or Further
Your Mentioned Link on that forum for your custom ROM was also not working so i didn't do anything further ....
Now Pls tell me what can be best custom ROM (MM.6.0 Or 7.0 Or 8.0) i can flash for this LRA M8 variant which will be fully compatible and wont cause any issues
Also The ROM Flashing procedure will remain same ?? copy file on SD card?? rename to particular file.zip and boot into bootloader??? i guess TWRP can also be used to flash custom rom?
so conclusion is my LRA m8 is on Stock RUU(mentioned above) + upgraded to 4.12.512.5 via software update
many thanks already for your help on M8 threads.. took me 3 days to read and understand it all and 3-4 hours to do that all..
regards
redpoint73 said:
The above information is misleading, and some if it is false. Reason I say that is:
- Factory reset is a bit of a misnomer. All it does is wipe user data. It does NOT magically restore the system or kernel.
- The SuperSU app will be deleted, since apps are user data. But the root binary itself will remain after factory reset, since it consists of changes to the system/kernel. In short, root changes will remain, and the phone will still show as "software modified".
- Since the software is still modified, it will NOT allow update.
- The phone will likely not update anyway(even if the software was unmodified). Most US variants of this phone will not update unless connected to that actual US carrier (in this case LRA).
Best way to return to full stock, is by RUU as supplied by ckpv5 above.
---------- Post added at 11:11 AM ---------- Previous post was at 11:02 AM ----------
Doesn't really matter whether it sends you to a bootloop or not; since (as I already described above) a factory reset does NOT remove root.
Root is on a system/kernel level. Nothing you do on the phone itself (without extra files) will "reset" it and unroot it. You must flash the stock software/ROM back to the phon in order to completely remove root.
My recommendation is to look at ckpv5's post above and follow his advice. He knows what he is talking about.
Click to expand...
Click to collapse
Thanks For Advice Bro..already did that what ckpv5 described on earlier posts and this one!
sp20v said:
Now Pls tell me what can be best custom ROM (MM.6.0 Or 7.0 Or 8.0) i can flash for this LRA M8 variant which will be fully compatible and wont cause any issues
Click to expand...
Click to collapse
I would suggest trying custom ROMs which specifically support the Verizon M8.
sp20v said:
Also The ROM Flashing procedure will remain same ?? copy file on SD card?? rename to particular file.zip and boot into bootloader??? i guess TWRP can also be used to flash custom rom?
Click to expand...
Click to collapse
You can only flash a custom ROM using TWRP. Put the ROM on SD card or phone's internal storage (either one, doesn't matter much which one). Then boot to TWRP. Make a backup of the current stock ROM (so you can revert, if needed). Then do a default wipe in TWRP (data, cache and Dalvik - obviously your user data will be wiped when you do this, internal storage will remain intact). Then go to "install" in TWRP. Select the ROM file, and it will flash.

Need some starting help

Hello guys,
I recently bought a used OnePlus 7T, with the goal in mind, to try to install Ubuntu Touch on it. There were some tries to do this in the past, there is posts on the forums here where a 7 Pro was successfully running UT.
Now while I am a software developer, I am a total beginner regarding 1) UT porting 2) Android in general. I have never used an Android device, and I am unfamiliar with the OS and all related terminology. The latter seems to give me some headaches at the moment, so I would like to ask you guys for some starting help.
When I received the phone it was running OOS 11, and I downgraded to OOS 10 as described here after I unlocked the boot loader and also installed TWRP (I think this was not needed yet, but well ...). And I think I didnt pay enough attention to it, since now it does not seem to be the EU version anymore; the about page tells me: "10.3.1.HD65AA", which I think means global? Does it have any impact on the functionality of the phone? Can I switch back to EU version? If so, how? Should I pick a EU-zip from here and flash it again?
Now since I was trying to downgrade even further to android 9 (in order to begin with the Ubuntu Touch related stuff), I tried to find a ZIP containing the OOS 9 downgrade, but I could find none. The closest which I found was this. However when I place the downloaded ZIP in the root folder ("OnePlus 7T" is the root folder? E.g. the one where I see subfolders like ".OTA", "SysQS", "TWRP"?), the system update will not pick it up in the local upgrade menu. It just doesn't find it. I already renamend it from .jar to .zip, but still it does not work. This makes me believe I downloaded the wrong ZIP.
Long story short, can someone help me to achieve the following:
1) Switch back to EU version
2) Downgrade to OOS 9
And I have some general questions:
1) TWRP is a tool which is installed on the recovery partition of the phone, and it can be booted into to install various things. It would for example allow to install a different Android version, as alternative to system -> software update -> gears -> local. Is that a correct summary? For which step would I actually need TWRP during the a) the downgrade process from 11 -> 9 and b) porting to UT?
2) Does the phone need to be rooted during the downgrade process, or when porting to UT?
3) What are the two slots which are shown in TWRP? Are those 2 partitions on the internal storage?
4) How many partitions (in the regular PC sense of partitions of a hard disk) does the phone have? 2? One for recovery, and one for the operating system? In the UBPorts docs I read that the vendor blobs reside on a separate partition since Android 9, so there must be at least 3 partitions on the phone? How do I make sure that I don't accidentially write e.g. on the vendor blobs partition? I guess that `fastboot flash recovery twrp.img` means that the *recovery* partition should be flashed, right?
I think thats it for now. Sorry for the wall of text, but its just so much information for a beginner, and its a bit overwhelming. But I want to get into it bit by bit, and maybe in the end contribute to the device porting, in case I manage to do it.
I don't think there is oos9 for op7t
Nope, came with oos10

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