Emui 9.1. The system partition does not go in rw - Huawei Mate 20 Pro Questions & Answers

Hello. I installed emui 9.1 on my mate20pro with the dload method. I unlocked the bootloader again and rooted the system with patched recovery. The phone is rooted, but the system partition remains in ro. I have tried various apps to mount the system in rw, but without success. I have also tried some commands found on the net both through adb and emulator, but nothing to do. I have also tried using rootexplorer which has been granted root permissions, but fails to modify anything, nor to insert or delete files within the system folders. What can be done?

ernia66 said:
Hello. I installed emui 9.1 on my mate20pro with the dload method. I unlocked the bootloader again and rooted the system with patched recovery. The phone is rooted, but the system partition remains in ro. I have tried various apps to mount the system in rw, but without success. I have also tried some commands found on the net both through adb and emulator, but nothing to do. I have also tried using rootexplorer which has been granted root permissions, but fails to modify anything, nor to insert or delete files within the system folders. What can be done?
Click to expand...
Click to collapse
it's the new filesystem called erofs (Extendable Read-Only File System)

So there's nothing to do?

Sorry OP if this is off topic , but its about magisk and root in 9.1
I have the "system partition remains in ro" issue too , its annoying yes , but I have a bigger problem
When "rooted" , the phone app ( dialer ), and the contacts app both get broken and crash .. So I have to fastbootflash twrp and lose root to make those apps to work normally again
Anyone with the same problem ?
I need root so I can change and use the font ( I like ) with a magisk module

ernia66 said:
So there's nothing to do?
Click to expand...
Click to collapse
Magisk can already 'replace on the fly' file from /system systemless-y.
It dies already support erofs.
Check Magisk documentations.
There is also a way to mount custom erofs partition....

which is?

ernia66 said:
which is?
Click to expand...
Click to collapse
Build your own erofs partitions (cf. erofs.mkfs)
Unmount stock ones and mount yours.
I just did some test 48h ago on erofs /cust and it seems to work...
-Mounting other file system type on same folder could even work !

oslo83 said:
Build your own erofs partitions (cf. erofs.mkfs)
Unmount stock ones and mount yours.
I just did some test 48h ago on erofs /cust and it seems to work...
-Mounting other file system type on same folder could even work !
Click to expand...
Click to collapse
Unfortunately I am not able to do it
:crying:

pvillasuso said:
Sorry OP if this is off topic , but its about magisk and root in 9.1
I have the "system partition remains in ro" issue too , its annoying yes , but I have a bigger problem
When "rooted" , the phone app ( dialer ), and the contacts app both get broken and crash .. So I have to fastbootflash twrp and lose root to make those apps to work normally again
Anyone with the same problem ?
I need root so I can change and use the font ( I like ) with a magisk module
Click to expand...
Click to collapse
use search button pls, you will find the solution already posted

ilos said:
use search button pls, you will find the solution already posted
Click to expand...
Click to collapse
Shhh
Here Rootexplorer paying app does not help writing on erofs partitions...
- Or did you meant something else ?

Magisk Doc. :
https://topjohnwu.github.io/Magisk/
So far, out-of-the-box, Magisk is already ready to replace systemless-ly files and paths on /system easily when used with modules.
-Module just need a a small tweak to add Magisk systemless-ly compatibility to other erofs partitions like /cust
Another way would be to bind or mount...

ilos said:
use search button pls, you will find the solution already posted
Click to expand...
Click to collapse
Wow , what , where ???
I did search but maybe I didnt use the right keywords for such an specific issue
Any extra help , would be very appreciated !

oslo83 said:
Build your own erofs partitions (cf. erofs.mkfs)
Unmount stock ones and mount yours.
I just did some test 48h ago on erofs /cust and it seems to work...
-Mounting other file system type on same folder could even work !
Click to expand...
Click to collapse
I'd like to create my own partition but I don't know how to do it. Is there any online guide for beginners that I can try?

oslo83 said:
Shhh
Here Rootexplorer paying app does not help writing on erofs partitions...
- Or did you meant something else ?
Click to expand...
Click to collapse
my reply was not for you but for the off topic before my reply: contact, ph app and message force close after root.
as I said, there is already a solution about force close.
Anyway I can only write in /system/etc and some over folders

oslo83 said:
Build your own erofs partitions (cf. erofs.mkfs)
Unmount stock ones and mount yours.
I just did some test 48h ago on erofs /cust and it seems to work...
-Mounting other file system type on same folder could even work !
Click to expand...
Click to collapse
Hi, I saw that you managed to get a custom erofs partition mounted using magisk. I was wondering if the same could be done for the/product folder because that would allow me to fix the DPI scaling issues found on EMUI 9.0-9.1. Would it be possible to see the code for your magisk module?

Ok, So.
After having a look at what I did with this WorkInProgress...
So far there is 2 main way I thought about and played with:
Method A
A1/
Using the mkfs.erofs tool to make your custom erofs partition and mount it over the original one. (mayne umount it before)
Thanks @ph03n!x for his work on mkfs.erofs.
Thanks @ante0 for his android arm build.
A2/
I did not yet tryed to flash via fastboot or adb these modded erofs images.
Method B
What I'm actually doing is just mounting systemless-y with a magisk module whole folders over erofs one ;
In post-fs-data.sh, I'm doing:
mount -o bind $MODDIR/cust /cust
mount -o bind $MODDIR/version /version
With a ~150MB custom /cust it is working ; It should be tryed/perfected for bigger folders.
Another way, to not replace/spoof the whole folders could be to mount the whole list of custom files at their respective path (-to be tested)
PS: I'm not sure if update-binary module's file should be modded with some:
mount /cust 2>/dev/null
@ line 42
Sources:
https://forum.xda-developers.com/huawei-p30-pro/how-to/erofs-mounting-accessing-img-t3944193

oslo83 said:
Ok, So.
After having a look at what I did with this WorkInProgress...
So far there is 2 main way I thought about and played with:
Method A
A1/
Using the mkfs.erofs tool to make your custom erofs partition and mount it over the original one. (mayne umount it before)
Thanks @ph03n!x for his work on mkfs.erofs.
Thanks @ante0 for his android arm build.
A2/
I did not yet tryed to flash via fastboot or adb these modded erofs images.
Method B
What I'm actually doing is just mounting systemless-y with a magisk module whole folders over erofs one ;
In post-fs-data.sh, I'm doing:
mount -o bind $MODDIR/cust /cust
mount -o bind $MODDIR/version /version
With a ~150MB custom /cust it is working ; It should be tryed/perfected for bigger folders.
Another way, to not replace/spoof the whole folders could be to mount the whole list of custom files at their respective path (-to be tested)
PS: I'm not sure if update-binary module's file should be modded with some:
mount /cust 2>/dev/null
@ line 42
Sources:
https://forum.xda-developers.com/huawei-p30-pro/how-to/erofs-mounting-accessing-img-t3944193
Click to expand...
Click to collapse
I'm rather new to this trying to do something similar on my EMUI9.1 using Magisk, I'm having a problem that i can replace anything in most other folders without much problem like /etc/ for example, but when i try to substitute /vendor/, whatever i put it the folder does not only fail to get substituted, it even disappears from the $MODDIR/system/vendor folder upon restart!
I.e. let's say I create a new file in $MODDIR/system/etc. Upon restart i'm successfully seeing that same file appear /etc.
However when I create a new file under $MODDIR/system/vendor, Upon restart i'm not seeing that under /vendor. ALSO the file is gone from $MODDIR/system/vendor like it was never there.
Any idea what is happening? I've also tried manually mounting in the post-fs-data.sh, where i put the following:
mount -o bind $MODDIR/system/vendor /vendor
That actually caused my system to freeze on the loading screen. I had to reset magisk to non-modded settings in order to get it to run again.
Any help's appreciated.

pvillasuso said:
Sorry OP if this is off topic , but its about magisk and root in 9.1
I have the "system partition remains in ro" issue too , its annoying yes , but I have a bigger problem
When "rooted" , the phone app ( dialer ), and the contacts app both get broken and crash .. So I have to fastbootflash twrp and lose root to make those apps to work normally again
Anyone with the same problem ?
I need root so I can change and use the font ( I like ) with a magisk module
Click to expand...
Click to collapse
i got the solution of above problem from this https://forum.xda-developers.com/huawei-p30-pro/how-to/guide-magisk-root-p30-pro-bl-code-t3938285

Hi I have almost the same issue after updating to EMUI 9.1 the phone hardbricked. It only shows as fastboot on my PC I tried flashing but not sending the img files please help

Related

Can't delete/modify system files.

Hello.
I've installed viper4android on my mido. Everything is ok, but there is a background static sound when music is being played. According to the viper FAQ I need to delete /system/lib/soundfx/libbundlewrapper.so. What did I do:
1. Mount system as rw
adb shell
su
mount -o rw,remount,rw /system
2. try to rename that file
cd /system/lib/soundfx
mv libbundlewrapper.so libbudnlewrapper-2.so.bak
3. No success. Trying to create backup in a file manager and than trying to delete it. Still no luck. Changed system to ro and I'll wait for suggestions.
The file is there like I haven't done anything. The uncharted territory of the system partition still awaits for me. What I can do next to get the thing to work?
Rust3dCor3 said:
Hello.
I've installed viper4android on my mido. Everything is ok, but there is a background static sound when music is being played. According to the viper FAQ I need to delete /system/lib/soundfx/libbundlewrapper.so. What did I do:
1. Mount system as rw
adb shell
su
mount -o rw,remount,rw /system
2. try to rename that file
cd /system/lib/soundfx
mv libbundlewrapper.so libbudnlewrapper-2.so.bak
3. No success. Trying to create backup in a file manager and than trying to delete it. Still no luck. Changed system to ro and I'll wait for suggestions.
The file is there like I haven't done anything. The uncharted territory of the system partition still awaits for me. What I can do next to get the thing to work?
Click to expand...
Click to collapse
What rom do you use? Miui or los/aosp? Also do you use, magisk or super su? Plus, please tell how did u Install viper, that is through recovery or by using magisk?.
MyNameIsRage said:
What rom do you use? Miui or los/aosp? Also do you use, magisk or super su? Plus, please tell how did u Install viper, that is through recovery or by using magisk?.
Click to expand...
Click to collapse
I use Official and final RR
The phone uses magisk and viper was flashed by magisk (should I remove the module and flash as non-system app?)
Rust3dCor3 said:
I use Official and final RR
The phone uses magisk and viper was flashed by magisk (should I remove the module and flash as non-system app?)
Click to expand...
Click to collapse
Why don't you use es file manager? I just tried i was able to do it with es.
MyNameIsRage said:
Why don't you use es file manager? I just tried i was able to do it with es.
Click to expand...
Click to collapse
Still does not work. I have no idea what to do. Again.
Renaming the file does not go despite a Toast is visible "Rename Successful" and while deleting there is "Device or resource busy"
Rust3dCor3 said:
Still does not work. I have no idea what to do. Again.
Renaming the file does not go despite a Toast is visible "Rename Successful" and while deleting there is "Device or resource busy"
Click to expand...
Click to collapse
Why don't you try deleting it from twrp.
MyNameIsRage said:
Why don't you try deleting it from twrp.
Click to expand...
Click to collapse
I tried. The funny part is that I can only see /system/usr. No other folder is in /system. Thats why I've posted this topic. I'm just lost.
Rust3dCor3 said:
I tried. The funny part is that I can only see /system/usr. No other folder is in /system. Thats why I've posted this topic. I'm just lost.
Click to expand...
Click to collapse
Nope, you haven't mounted system in twrp, that's the reason you are only seeing /usr
So do this
From main menu, select "mount" and there select System, also make sure that the "system" box is checked and the box saying "mount system partition as read only" is unchecked(I've attached a screenshot for reference). Now you can easily go to /system and it should list the files and folders., And you can delete the file you want. Quote me if you need more help
MyNameIsRage said:
Nope, you haven't mounted system in twrp, that's the reason you are only seeing /usr
So do this
From main menu, select "mount" and there select System, also make sure that the "system" box is checked and the box saying "mount system partition as read only" is unchecked(I've attached a screenshot for reference). Now you can easily go to /system and it should list the files and folders., And you can delete the file you want. Quote me if you need more help
Click to expand...
Click to collapse
I can't believe how stupid I am. Thank You for Your advice.

[HUAWEI] Offline charge fix for every Huawei Treble Enabled Phone

Huawei, again, wew.
At the moment, charging offline while on GSI, reboots the phone to the OS.
So, let's simply fix that by:
Downloading this zip;
Pushing it by any means* in the path /vendor/etc/charger (please don't create duplicates path like /vendor/etc/charger/charger, make sure you do it correctly)
Execute:
Code:
ln -s /vendor/etc/charger /system/etc/charger
*You can actually use adb within OS:
adb root
adb remount
adb push​or you can mount all partitions within TWRP Mount option, and just push the dir via adb.
Peace.
Dil3mm4 said:
Huawei, again, wew.
At the moment, charging offline while on GSI, reboots the phone to the OS.
So, let's simply fix that by:
Downloading this zip;
Pushing it by any means* in the path /vendor/etc/charger (please don't create duplicates path like /vendor/etc/charger/charger, make sure you do it correctly)
Execute:
*You can actually use adb within OS:
adb root
adb remount
adb push
or you can mount all partitions within TWRP Mount option, and just push the dir via adb.
Peace.
Click to expand...
Click to collapse
Error pushing on adb, Doesn't work on mate 9,will appreciate if you provide more instructions for installation.
Thank you!
The partitions are mostly to small partitioned... On honor 9 lite i used product partition instead...
Its not forever... every dirty flash on system or updating vendor security patch level will drop it. A magisk module dont work cause its mounted to late...
Darkest-Dark said:
The partitions are mostly to small partitioned... On honor 9 lite i used product partition instead...
Its not forever... every dirty flash on system or updating vendor security patch level will drop it. A magisk module dont work cause its mounted to late...
Click to expand...
Click to collapse
"Nothing lasts forever and we both know hearts can change"
-Guns 'N' Roses
Anyways, yeah, updates on vendor will wipe this "hack".
But, better than nothing
No need for this if you wipe data with stock recovery and then flash ROM + GApps, and then factory reset in stock recovery. My phone chargea fine in "offline mode."
Dil3mm4 said:
"Nothing lasts forever and we both know hearts can change"
-Guns 'N' Roses
Anyways, yeah, updates on vendor will wipe this "hack".
But, better than nothing
Click to expand...
Click to collapse
Directly modifying /system/etc/charger also seems to be effective.Could you make it into a magisk module?
Ccboxes said:
Directly modifying /system/etc/charger also seems to be effective.Could you make it into a magisk module?
Click to expand...
Click to collapse
Here's your answer. Read the thread first.
Darkest-Dark said:
A magisk module dont work cause its mounted to late...
Click to expand...
Click to collapse
Thanks for this Fix. Works awesome on Mate 10 lite with RR Official.
I installed on other way cause ADB provided to many Error Messages.
Downloaded ZIP
Extraxted ZIP File
Copied the extracted Folder to /vendor/etc/ with Root Explorer. (Asked me to mount as R/W. Says YES)
This Takes some minutes.
Rebooted to TWRP, mounted system and vendor
Opened the TWRP Terminal and executed the Command
ln -s /vendor/etc/charger /system/etc/charger
Done and works awesome Thank you Dil3mm4 !
Dil3mm4 said:
Huawei, again, wew.
At the moment, charging offline while on GSI, reboots the phone to the OS.
So, let's simply fix that by:
Downloading this zip;
Pushing it by any means* in the path /vendor/etc/charger (please don't create duplicates path like /vendor/etc/charger/charger, make sure you do it correctly)
Execute:
Code:
ln -s /vendor/etc/charger /system/etc/charger
*You can actually use adb within OS:
adb root
adb remount
adb push​or you can mount all partitions within TWRP Mount option, and just push the dir via adb.
Peace.
Click to expand...
Click to collapse
Hey,
I did everything like destriben, but it did not work for my Mediapad M5,
it still boots up when I wanted to change while my device is powered off.
anyone to tell me how i can use this on aosp 8,1 treble rom ? i am new on huawei, treble rom ... thanks
leap_ahead said:
anyone to tell me how i can use this on aosp 8,1 treble rom ? i am new on huawei, treble rom ... thanks
Click to expand...
Click to collapse
anyone ?
leap_ahead said:
anyone ?
Click to expand...
Click to collapse
Dude, there is this new term called reading the thread, i know it's a bit hard to take in at first, but you'll get the hang of it. If you can't read, then you shouldn't be here.
This cause reboot constantly.
i've p8 lite 2017 (Pra-LX1) with GSI 8.1
crayonicle said:
Dude, there is this new term called reading the thread, i know it's a bit hard to take in at first, but you'll get the hang of it. If you can't read, then you shouldn't be here.
Click to expand...
Click to collapse
I read the instruction.but many user and me have problem with this,
so its not my false
leap_ahead said:
I read the instruction.but many user and me have problem with this,
so its not my false
Click to expand...
Click to collapse
if many users, including you, that have this problem, then all of you should read the thread, again and again until you understand
the instructions are very clear on what to do.
Everytime we flash a new system image this command has to be executed, right @Dil3mm4?
Will it work if @phhusson includes the "ln" command to the script rw-system.sh, after identifying the device as an Huawei device?
that`s good
I have already post a second variant of tutorial. Works 100% and its easy.
TUT 2:
Downloaded ZIP
Extraxted ZIP File
Copied the extracted Folder to /vendor/etc/ with Root Explorer. (Asked me to mount as R/W. Says YES)
This Takes some minutes.
Rebooted to TWRP, mounted system and vendor
Opened the TWRP Terminal and executed the Command
ln -s /vendor/etc/charger /system/etc/charger
Reboot and done
Copkiller2010 said:
I have already post a second variant of tutorial. Works 100% and its easy.
TUT 2:
Downloaded ZIP
Extraxted ZIP File
Copied the extracted Folder to /vendor/etc/ with Root Explorer. (Asked me to mount as R/W. Says YES)
This Takes some minutes.
Rebooted to TWRP, mounted system and vendor
Opened the TWRP Terminal and executed the Command
ln -s /vendor/etc/charger /system/etc/charger
Reboot and done
Click to expand...
Click to collapse
same things done but not working, huawei p20 lite android 10
I have this offline charging problem also in my Lenovo s5.

Help: Removing system files using adb without root

So basically I'm using Xiaomi's Redmi Note 7 Pro and its camera skips frames when recording video and in one forum ( This one ) , in that forum that guy suggests to delete the thermal configuration file for the camera app which is limiting the camera from functioning smoothly.
So the problem is its in system directory and I really can't afford to root my device right now. I really can't. And while browsing along the internet, I found another forum ( This one ) which says you can remove some system apps without root just using some commands in ADB.
That made me think if theres a command for deleting a file through ADB and I found this forum ( This one ) which gave me this command ( rm /sdcard/0/file_to_delete ) .
I'm really Noob at these things and I want your help.
I used FX File explorer to check if the file exists and I can see it, but cant delete cos its read only and my device is not rooted. The file is in /vendor/etc/thermal-engine-camera.conf (or) system/vendor/etc/thermal-engine-camera.conf . I dont know if i should include the /system/ before /vendor/ or not, im nub.
So please tell me whats the proper command with the directory or if it wont work. I really want to get rid of that config file which is messing up the videos im recording and i really cant root Thank you
@MahuRDX
Short answer: IT'S NOT POSSIBLE.
jwoegerbauer said:
@MahuRDX
Short answer: IT'S NOT POSSIBLE.
Click to expand...
Click to collapse
why? I mean theres a way people removed system apps without root using adb commands, so why not a config file?
MahuRDX said:
why? I mean theres a way people removed system apps without root using adb commands, so why not a config file?
Click to expand...
Click to collapse
Wondering why then you don't do how that people did?
FYI: Both the /system and the /vendor partition is READ-ONLY.
jwoegerbauer said:
Wondering why then you don't do how that people did?
FYI: Both the /system and the /vendor partition is READ-ONLY.
Click to expand...
Click to collapse
ok so im assuming that the system apps they deleted were in some other directory. thanks man

Can't mount /system R/W in either TWRP or OFox

I wanted to delete some files from the system like some useless system apps/themes etc. I was trying to root my phone with magisk. The magisk would install but I couldn't make any kind of changes because I found it was read-only! Now if I want it to mount read-write, it just won't. Any solutions, anyone?
Resmi Note 9S Curtana, OFox R11 installed with xiaomi.eu 12.0.1.0, android 11
Try this script from this thread.
You can't mount system because of dynamic partitions (super partition). The script linked above doesn't mount system rw, it just makes a new super partition.
The real way to make edits to dynamic partitions is with adb remount which replaces the old 'mount -o rw, remount /system' method.
The practical way to make edits is systemlessly with a magisk module.
Adb remount info
Dynamic partitions info
jwchips said:
You can't mount system because of dynamic partitions (super partition). The script linked above doesn't mount system rw, it just makes a new super partition.
The real way to make edits to dynamic partitions is with adb remount which replaces the old 'mount -o rw, remount /system' method.
The practical way to make edits is systemlessly with a magisk module.
Adb remount info
Dynamic partitions info
Click to expand...
Click to collapse
I feel superdumb but @jwchips , where am I supposed to put those commands- in custom recovery terminals, in Windows command prompt or in a terminal emulator app?
Plz someone teach me step by step. I can't rw system by root explorer in miui rom, but I can do it in aosp rom. I don't know what causing this result. Since android 2 to android 11. Every upgrade time I struggle a lot. Now I spend 2 mouth to search internet but for code noob like me, get nothing. I'm still study it hope a newvice tutorial post.
same problem here, ive tried different zips and also doing it manually, no success
Azamsm said:
I wanted to delete some files from the system like some useless system apps/themes etc. I was trying to root my phone with magisk. The magisk would install but I couldn't make any kind of changes because I found it was read-only! Now if I want it to mount read-write, it just won't. Any solutions, anyone?
Resmi Note 9S Curtana, OFox R11 installed with xiaomi.eu 12.0.1.0, android 11
Click to expand...
Click to collapse
Why not try debloater magisk?
GitHub - sunilpaulmathew/De-Bloater: An application using the power of Magisk to debloat unwanted system apps!
An application using the power of Magisk to debloat unwanted system apps! - GitHub - sunilpaulmathew/De-Bloater: An application using the power of Magisk to debloat unwanted system apps!
github.com

Build.prop file accidentally got empty and haven't rebooted yet. Any ways to restore it?

Build.prop file accidentally got empty and haven't rebooted yet. Any ways to restore it?
Am i screwed?
You have a customer recovery? Then you can dirty flash your rom
I definitely would have done that if i did.
But TWRP was never released for my phone (poco x3 gt)
Depends the device and android version I guess...
I would do getprop and edit the output to build.prop form.
Notice to chmod the file correctly, 644 or whatever..
I think you can reboot safely because build.prop is inside super partition and therefore read-only.
of course you can download stock ROM from xiaomifirmwareupdater and extract build.prop from super.img, but it's more easy to flash super.img from fastboot.
aIecxs said:
I think you can reboot safely because build.prop is inside super partition and therefore read-only.
of course you can download stock ROM from xiaomifirmwareupdater and extract build.prop from super.img, but it's more easy to flash super.img from fastboot.
Click to expand...
Click to collapse
Nvm my phone just got an OTA update.
I just have to restore the root now
aIecxs said:
I think you can reboot safely because build.prop is inside super partition and therefore read-only.
Click to expand...
Click to collapse
And it's empty like how? Weird crap anyway... ok now, so who cares...
Idk but /system /vendor /product /system_ext /odm are ro dynamic partitions inside super partition, either OP did re-duplicate blocks with e2fsck -E unshare_blocks and disabled avb/dm-verity to allow remount rw / system_root (would break OTA), or it simply wasn't written to build.prop at all (magisk systemless overlay)? "empty" could also mean does not exist/no permissions...
https://github.com/Yuyuko1024/device_xiaomi_chopin/blob/lineage-18.1/rootdir/etc/fstab.mt6891
TWRP is available btw
https://forum.xda-developers.com/t/twrp-unofficial-3-6-0-poco-x3-gt-redmi-note-10-pro-5g.4369207

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