Database Users

If Phone is Rooted and At A Store You Want to Use Google Pay..

If you have rooted your N6P and you are at a store and want to use Google Pay, is there a way of quickly (on the fly as it were ) unrooting the phone,, making purchase and then rerooting?

Go into SuperSU. Uncheck Enable Superuser. Add your cards. Turn root back on and you're good to go. It appears the only caveat to root is that you're unable to add payment methods. You should be able to pay.

Cares said:
Go into SuperSU. Uncheck Enable Superuser. Add your cards. Turn root back on and you're good to go. It appears the only caveat to root is that you're unable to add payment methods. You should be able to pay.
Click to expand...
Click to collapse
Have you actually tested this at a terminal? Everything I've read says root or custom roms will not work with Android Pay. You can unroot and add the cards, but it will still not function at a POS terminal. I am yet to find someone that can confirm it works the way you mentioned. Everyone agrees that you can add the cards... but that's where the functionality stops.

Tried this method on my Nexus 6. It knows I'm rooted, even if I've disabled SU entirely and rebooted.

Have a search about, at least one of two people have confirmed that they have paid with root disabled, but only if the system partition hasn't been changed

So how do you ensure the system partition is not changed?

kboya said:
Have a search about, at least one of two people have confirmed that they have paid with root disabled, but only if the system partition hasn't been changed
Click to expand...
Click to collapse
Pardon my ignorance here... but doesn't rooting the device modify the system partition? If not... maybe that's the difference with the other threads I've seen. Everyone was using custom roms as far as I know. I'd like to be able to root so I can use adblocker and still use Android Pay. I can live without a custom rom on stock android... but I really miss adblocker.

teknomar7 said:
Have you actually tested this at a terminal? Everything I've read says root or custom roms will not work with Android Pay. You can unroot and add the cards, but it will still not function at a POS terminal. I am yet to find someone that can confirm it works the way you mentioned. Everyone agrees that you can add the cards... but that's where the functionality stops.
Click to expand...
Click to collapse
I just added my cards. I'll test it out later today. Need to find a store that takes Android Pay

teknomar7 said:
Pardon my ignorance here... but doesn't rooting the device modify the system partition? If not... maybe that's the difference with the other threads I've seen. Everyone was using custom roms as far as I know. I'd like to be able to root so I can use adblocker and still use Android Pay. I can live without a custom rom on stock android... but I really miss adblocker.
Click to expand...
Click to collapse
There's a root without changing system. As I said, have a search about. I read it earlier today or perhaps yesterday. There's a thread about the root without system.

Thanks... found the link.
http://www.xda-developers.com/chainfire-releases-root-for-android-6-0-without-modifying-system/

cool, no worries.

So I can confirm that Android Pay will not let you add cards while rooted, but it will let you complete a payment at a terminal while root in SuperSU is enabled. So once you have your payments setup, you can root and use Android Pay.
I own a store with a terminal that accepts Android Pay and have tested it a few different ways over the past 2 days. Every way worked. Unrooted, root simply disabled, root enabled.
The only thing root does is makes it so you can't add a card.
And I have regular root, not the new systemless root.

ArkAngel06 said:
So I can confirm that Android Pay will not let you add cards while rooted, but it will let you complete a payment at a terminal while root in SuperSU is enabled. So once you have your payments setup, you can root and use Android Pay.
I own a store with a terminal that accepts Android Pay and have tested it a few different ways over the past 2 days. Every way worked. Unrooted, root simply disabled, root enabled.
The only thing root does is makes it so you can't add a card.
And I have regular root, not the new systemless root.
Click to expand...
Click to collapse
Can you still pay after a reboot? Thanks.

It works. I wish the misinformation would simply stop. It has worked on devices in the past, it works on devices now and it will most likely work on devices in the future. We had threads before launch how root would disable bank apps, fingerprint sensor, android pay etc and it is all simply untrue.
It works.

boxcar8028 said:
Can you still pay after a reboot? Thanks.
Click to expand...
Click to collapse
Lol, I'll have to try tomorrow.

Was this explanation debunked, then?
http://www.xda-developers.com/googl...-with-root-and-android-pay-in-the-xda-forums/

You
Aridon said:
It works. I wish the misinformation would simply stop. It has worked on devices in the past, it works on devices now and it will most likely work on devices in the future. We had threads before launch how root would disable bank apps, fingerprint sensor, android pay etc and it is all simply untrue.
It works.
Click to expand...
Click to collapse
Yes, but Google stated that Android Pay can't be used with root. So of course there will some question to it.
source
And root absolutely does effect Android Pay. However if seems only while adding payment methods, and nothing once they are added.

What Google is using to determine if the device has been tampered with: https://koz.io/inside-safetynet/
Its definitely an interesting and pretty secure setup. Since it seems to happen real-time, maybe they turned off the "su_files" check and thats why Android Pay works on rooted devices now.

boxcar8028 said:
Can you still pay after a reboot? Thanks.
Click to expand...
Click to collapse
So tried it again today after rebooting with root enabled and it does not work. So there you go. Android Pay does not work while rooted, period.
It does work with root simply disabled in the SuperSu app and then a reboot.
Maybe the new systemless root, though chainfire said if it does work, it was unintentional and Google will probably patch it.

ArkAngel06 said:
So tried it again today after rebooting with root enabled and it does not work. So there you go. Android Pay does not work while rooted, period.
It does work with root simply disabled in the SuperSu app and then a reboot.
Maybe the new systemless root, though chainfire said if it does work, it was unintentional and Google will probably patch it.
Click to expand...
Click to collapse
This is correct. If you try to pay, after adding your cards and re rooting, it will fail.
You must disable root again to pay. You can reenable after.

Android Pay Cannot Be Used

first of all i'm sorry if this has been answered already, but i could not find the answer.
My 6P is setup as follows:
MDB08L build
rooted with systemless root and TWRP
xposed v78 sdk 23
xposed mods:
greenify
gravitybox
App Settings
No Lock Home
Snapprefs
Xinsta
Custom Share
i try to activate my AMEX on android pay and i get the error message stating that Google cannot verify the software (same message as if i was running a rom)
i have tried to unroot in SuperSU and then add the card...no difference
can anyone help me out here?

It won't work if you are rooted. Some people have said that temp unroot works, but I've never been able to get it.

Xposed modifies system, pay won't work

akellar said:
Xposed modifies system, pay won't work
Click to expand...
Click to collapse
alright. i'm going to try to uninstall xposed. add the card and see what happens then i guess.
Thanks!

No AP with root, even systemless root. There might be a few that have said they have figured it out but in general 99.9% of people say it will not work.

I came from an Lg G3 with root and Xposed.
You cannot add cards if Xposed is installed. FIle systesm is checked.
You need to uninstall Xposed.
Once the cards are added re-install Xposed and root.
Use the module "No Device Check" to be able to use Android Pay.
I have Xposed and root and use Pay with no issues.

steveo17 said:
alright. i'm going to try to uninstall xposed. add the card and see what happens then i guess.
Thanks!
Click to expand...
Click to collapse
jawmail said:
No AP with root, even systemless root. There might be a few that have said they have figured it out but in general 99.9% of people say it will not work.
Click to expand...
Click to collapse
yep so even without xposed and disabling root, i cannot activate android pay.
oh well

I have used android pay with system less root.

No android pay with root, it's actually the first time i didnt immediately root my phone

what are u talking about guys? i have full stock, bootloader locked, but still can't use android pay, tells me that it is not available on this device

emiwonder said:
what are u talking about guys? i have full stock, bootloader locked, but still can't use android pay, tells me that it is not available on this device
Click to expand...
Click to collapse
What are you talking about? Android pay absolutely works fine on this and every other device with nfc.

emiwonder said:
what are u talking about guys? i have full stock, bootloader locked, but still can't use android pay, tells me that it is not available on this device
Click to expand...
Click to collapse
Where are you?

emiwonder said:
what are u talking about guys? i have full stock, bootloader locked, but still can't use android pay, tells me that it is not available on this device
Click to expand...
Click to collapse
Works perfectly fine on a stock 6P in the U.S.

tech_head said:
Where are you?
Click to expand...
Click to collapse
i am in Canada

Lots of misinformation about this. Android pay works fine if you use systemless root. I have it on my phone currently.

Is pay available in Canada
Sent from my Nexus 6P using Tapatalk

tech_head said:
Is pay available in Canada
Sent from my Nexus 6P using Tapatalk
Click to expand...
Click to collapse
No. And all banks except RBC in Canada who have tap to pay apps won't work either as the use secure SIM
Sent from my Nexus 6P using Tapatalk

grubbster said:
Lots of misinformation about this. Android pay works fine if you use systemless root. I have it on my phone currently.
Click to expand...
Click to collapse
I too am having problems adding a card to Android Pay due to the "Google is unable to verify. . ." error. I'm on stock ROM, and followed the directions for system-less root (thanks for that thread!).
One thing I'm starting to suspect is that when I first booted TWRP, upon being asked to keep system read only, I chose to "swipe to allow modifications".
Does anyone think this action, of allowing TWRP to modify the system partition, is the root cause for Android Pay not working? Is there a way to undo this action in TWRP, to put the system partition back to read-only?
Thanks!

sentinel230 said:
I too am having problems adding a card to Android Pay due to the "Google is unable to verify. . ." error. I'm on stock ROM, and followed the directions for system-less root (thanks for that thread!).
One thing I'm starting to suspect is that when I first booted TWRP, upon being asked to keep system read only, I chose to "swipe to allow modifications".
Does anyone think this action, of allowing TWRP to modify the system partition, is the root cause for Android Pay not working? Is there a way to undo this action in TWRP, to put the system partition back to read-only?
Thanks!
Click to expand...
Click to collapse
i'm assuming you're rooted with SuperSU 2.62?
you have to delete SU/Bin i think to get it to work

It is available on this device, but is geographically dependent. If you live in a location where Android Pay is available and are completely stock and unrooted it will work. You then go into the lottery once you start looking at root etc.

Help w tuten1000's Guide: Root + custom kernel + clean rom

In the last week I received my xperia x compact completely stock. First thing I do when I get a new phone before even activating it is root it. I was utilizing this guide to root my xperia x compact "Guide: Root + Custom Kernel + Clean rom + TA for X Compact" and I am stuck on the step where you are instructed to flash the modified XC-GenesisKernel-v1.04-nodrm kernel and SU. Flashing this kernel always results in a boot loop (Ive waited more then 30 minutes for it to resolve). I reflash the stock service exchange unit - 34.1.A.1.198 MM firmware to get back a functioning phone. The guide recommends:
"Run xperifirm and download the "service exchange unit - 34.1.A.1.198" firmware for posterity and latest rom for your region."
Am I supposed to use the most current nougat firmware for the following steps and only use the service exchange unit firmware if I need to downgrade to the lower original firmware? The thread for the XC-GenesisKernel states it is for nougat roms, which would explain a boot loop when I try to use the service exchange unit MM rom. Ideally Id like to stay on MM so that I can use xposed. Root and the phone being fully functional with no loss of camera and such is my main desire, xposed is secondary. I have a Backup TA of my DRM keys, the phone bootloader is unlocked, and I am looking for a little direction / clarification, any help in this respect is greatly appreciated.
Thanks

efaustus9 said:
help in this respect is greatly appreciated.
Click to expand...
Click to collapse
Click the first link in the guide and read it.

XperienceD said:
Click the first link in the guide and read it.
Click to expand...
Click to collapse
Thanks, I read through it and I see indeed the latest nougat firmware is what I should use in the later steps of tuten1000's guide and is the source of the boot loop I am experiencing.
If possible I would like to stay on marshmallow so I can used xposed framework. Are you aware of or can you recommend a kernel I can flash that will give me root, fingerprint, and use of most DRM functions while still on marshmallow.

Maybe you can try my guide using Magisk with full DRM, Xposed and root. But you need to flash back to MM first if you need Xposed.
https://forum.xda-developers.com/x-compact/how-to/android-pay-safety-net-rooted-unlocked-t3610342

itandy said:
Maybe you can try my guide using Magisk with full DRM, Xposed and root. But you need to flash back to MM first if you need Xposed.
https://forum.xda-developers.com/x-compact/how-to/android-pay-safety-net-rooted-unlocked-t3610342
Click to expand...
Click to collapse
Excellent itandy, this this just what I had in mind. I never downloaded and flashed a nougat rom as xposed was important to me. In following tuten1000's guide I did flash the XC genesis kernel as well as SU in recovery. This resulted in a boot loop but a prerequisite in your guide is a /system partition without any trace of su. Since I reflashed the stock service exchange unit 34.1.A.1.198 MM firmware I should be good to proceed right?

efaustus9 said:
Excellent itandy, this this just what I had in mind. I never downloaded and flashed a nougat rom as xposed was important to me. In following tuten1000's guide I did flash the XC genesis kernel as well as SU in recovery. This resulted in a boot loop but a prerequisite in your guide is a /system partition without any trace of su. Since I reflashed the stock service exchange unit 34.1.A.1.198 MM firmware I should be good to proceed right?
Click to expand...
Click to collapse
You're all good to begin with MM stock ROM.

itandy said:
You're all good to begin with MM stock ROM.
Click to expand...
Click to collapse
It worked beautifully, thank you so much itandy :victory:
Anyway to get rid of the device is not secure screen on boot?

efaustus9 said:
It worked beautifully, thank you so much itandy :victory:
Anyway to get rid of the device is not secure screen on boot?
Click to expand...
Click to collapse
This is a common request but the answer is no.

itandy said:
This is a common request but the answer is no.
Click to expand...
Click to collapse
Okay, it would be nice to be rid of but it is a worthwhile trade off.
In your guide you mention a safety net, and installing xposed breaks it. What is this safety net and what is the draw back to breaking it? Am I locked out of certain apps or functions?

efaustus9 said:
Okay, it would be nice to be rid of but it is a worthwhile trade off.
In your guide you mention a safety net, and installing xposed breaks it. What is this safety net and what is the draw back to breaking it? Am I locked out of certain apps or functions?
Click to expand...
Click to collapse
SafetyNet is the security checking API used by some apps like Android Pay and Pokemon Go to make sure your device is not tampered with. Simply put it makes sure your device is stock, not unlocked, rooted or modified. Magisk currently is able to bypass SafetyNet checking for root and some other "unwanted" apps. But Xposed will still be detected because it works in much lower system level. And with Magisk you can simply disable Xposed temporarily and reboot if you want to use, say, Android Pay.

itandy said:
SafetyNet is the security checking API used by some apps like Android Pay and Pokemon Go to make sure your device is not tampered with. Simply put it makes sure your device is stock, not unlocked, rooted or modified. Magisk currently is able to bypass SafetyNet checking for root and some other "unwanted" apps. But Xposed will still be detected because it works in much lower system level. And with Magisk you can simply disable Xposed temporarily and reboot if you want to use, say, Android Pay.
Click to expand...
Click to collapse
ah very informative, thanks again.
I installed the xposed framework SDK23 in Magisk manager, it is showing up as installed under modules in magisk but xposed is not in the app drawer and I cant seem to access it.

efaustus9 said:
ah very informative, thanks again.
I installed the xposed framework SDK23 in Magisk manager, it is showing up as installed under modules in magisk but xposed is not in the app drawer and I cant seem to access it.
Click to expand...
Click to collapse
You need to install Xposed Installer separately. Try this unofficial app.
https://forum.xda-developers.com/xposed/material-design-xposed-installer-t3137758

itandy said:
You need to install Xposed Installer separately. Try this unofficial app.
https://forum.xda-developers.com/xposed/material-design-xposed-installer-t3137758
Click to expand...
Click to collapse
Haha once again you come through. You are really helping me get this all sorted with so little fuss, I am very grateful.
This is my first xperia experience, I am coming from a samsung s3 running a KK slimrom and things are a bit different on this device. Any other pointers or recommendations for this new phone? Is there a way to make the soft key bar transparent so I can actually utilize the full 4.6"?

efaustus9 said:
Haha once again you come through. You are really helping me get this all sorted with so little fuss, I am very grateful.
This is my first xperia experience, I am coming from a samsung s3 running a KK slimrom and things are a bit different on this device. Any other pointers or recommendations for this new phone? Is there a way to make the soft key bar transparent so I can actually utilize the full 4.6"?
Click to expand...
Click to collapse
I remember there're mods (maybe Xposed modules) to make the navbar autohide. Maybe you'd also like to check out my navbar Xposed module. See my signature.

itandy said:
I remember there're mods (maybe Xposed modules) to make the navbar autohide. Maybe you'd also like to check out my navbar Xposed module. See my signature.
Click to expand...
Click to collapse
Great, I will definitely check out your app. Ideally Id like to mimic what I believe is called the "immersive mode" in supported apps. In this mode the app takes up the full screen and the icons are replaced with three persistent minimal dots.

Android Pay can't be used with an unlocked bootloader?

I just received the OP5 yesterday and unlocked the bootloader. I got the "Android Pay can't be used on this device" message when I try to add a credit card on android pay. Does anyone know if I need twrp and magisk installed in order for android pay to work?

dslreports said:
I just received the OP5 yesterday and unlocked the bootloader. I got the "Android Pay can't be used on this device" message when I try to add a credit card on android pay. Does anyone know if I need twrp and magisk installed in order for android pay to work?
Click to expand...
Click to collapse
in theory according to posts ive seen for other devices you need magisks latest beta version.

dslreports said:
I just received the OP5 yesterday and unlocked the bootloader. I got the "Android Pay can't be used on this device" message when I try to add a credit card on android pay. Does anyone know if I need twrp and magisk installed in order for android pay to work?
Click to expand...
Click to collapse
Check by Playstore>settings... you're probably uncertified...
EDIT: You need magisk to pass the safetynet...

Correct. It says uncerified for me. The only thing i did was unlock bootloader. Sigh. I guess i have to twrp and magisk. Thanks.

dslreports said:
Correct. It says uncerified for me. The only thing i did was unlock bootloader. Sigh. I guess i have to twrp and magisk. Thanks.
Click to expand...
Click to collapse
Usually deleting Play Store data and cache fixes the "uncertified" issue. It did with my OnePlus 3/3T. It didn't work for me with the OnePlus 5 however.

EVR_PR said:
Usually deleting Play Store data and cache fixes the "uncertified" issue. It did with my OnePlus 3/3T. It didn't work for me with the OnePlus 5 however.
Click to expand...
Click to collapse
It won't unless you either 1) Use magisk as mentioned or 2) use a custom kernel with SafeyNet patches.
When you unlock your bootloader, the prop (which you can read using a terminal emulator and typing getprop) has a flag called verifiedbootstate. If it returns anything but green SafeyNet will fail.
Sent from my OnePlus 3T using XDA Labs

U need to flash latest magisk and pass the safetynet to make Androidpay to work.

this is probably a stupid question but it's been a while since ive used android ... can you use android pay if you don't unlock the boot loader?

gameofdroness said:
this is probably a stupid question but it's been a while since ive used android ... can you use android pay if you don't unlock the boot loader?
Click to expand...
Click to collapse
Of course..why not...

HatRiGt said:
U need to flash latest magisk and pass the safetynet to make Androidpay to work.
Click to expand...
Click to collapse
I've flashed v. 13 (https://forum.xda-developers.com/apps/magisk/beta-magisk-v13-0-0980cb6-t3618589) and worked as a charm!

I have both the newest version of Magisk and the manager, but I'm still failing safetynet, do I need to manually hide something else in magisk hide? Any help is greatly appreciated

oowaymike said:
I have both the newest version of Magisk and the manager, but I'm still failing safetynet, do I need to manually hide something else in magisk hide? Any help is greatly appreciated
Click to expand...
Click to collapse
Try the latest stable version of Magisk. It worked for me a few days ago while the beta wasn't (beta is working for me lately though).
You might want to reflash stock boot partition before flashing Magisk, I don't know if it will make a difference...

yubimusubi said:
Try the latest stable version of Magisk. It worked for me a few days ago while the beta wasn't (beta is working for me lately though).
You might want to reflash stock boot partition before flashing Magisk, I don't know if it will make a difference...
Click to expand...
Click to collapse
Thanks for the suggestions. I tried the stable version with no luck as well. I'll wait for the next beta version, and if that doesn't do the trick ill try reflashing the stock partition. If anyone finds a custom kernel that gets around safety net I'd really appreciate it.

dslreports said:
Correct. It says uncerified for me. The only thing i did was unlock bootloader. Sigh. I guess i have to twrp and magisk. Thanks.
Click to expand...
Click to collapse
I'm curious to know why one would unlock the bootloader if not at least to install custom recovery and root.

Eric214 said:
I'm curious to know why one would unlock the bootloader if not at least to install custom recovery and root.
Click to expand...
Click to collapse
I don't know if this is OP'S reason, but you can boot TWRP without actually installing it... So you can take nandroid backups of an otherwise stock device.
Also, unlocking bootloader wipes your phone, so if you want it stock for now but think you might root in the future you won't have to deal with that...
TBH though, SafetyNet is working as advertised by failing an unlocked bootloader. We like to have our cake and eat it too.

[Magisk] How will I install Android 10 when I receive it without losing root?

Will it be the same way as the small security updates?
I.e. (from Magisk) install to inactive slot before restarting the phone.
Also, Android 10 has the faster security updates feature which installs them without restarting the phone. So when I do get Android 10, and receive a security update, won't it directly install and remove root even before I reboot through magisk?

I think clean flash should be the best option (I'm talking about the update from 9 to 10).

onliner said:
I think clean flash should be the best option (I'm talking about the update from 9 to 10).
Click to expand...
Click to collapse
I don't wanna lose my data ?

usaid.shafqat said:
I don't wanna lose my data
Click to expand...
Click to collapse
If you dont know how to back up your data, then you have no business rooting your phone. Leave it stock, or better yet, get an iPhone.

thedrizzle said:
If you dont know how to back up your data, then you have no business rooting your phone. Leave it stock, or better yet, get an iPhone.
Click to expand...
Click to collapse
I use titanium but what I meant by "not losing my data" was that I would want to avoid logging into all my accounts again as much as I could.

usaid.shafqat said:
Will it be the same way as the small security updates?
I.e. (from Magisk) install to inactive slot before restarting the phone.
Also, Android 10 has the faster security updates feature which installs them without restarting the phone. So when I do get Android 10, and receive a security update, won't it directly install and remove root even before I reboot through magisk?
Click to expand...
Click to collapse
Which version 6t do you have?

twinnfamous said:
Which version 6t do you have?
Click to expand...
Click to collapse
Running the latest: 9.0.16

usaid.shafqat said:
Running the latest: 9.0.16
Click to expand...
Click to collapse
I meant is it T-Mobile or international?
The T-Mobile one is most likely going to be difficult

Hi there...
I've just clean this thread slightly. This is a thread in the Q&A forum, which allows to ask EVERYTHING that is somehow related to this device. There hasn't been a similar thread yet i.e. it was fine to create one.
If someone doesn't like the topic, some questions or answers simply continue your journey and refrain from posting here.
Your friendly neighbourhood watch

Guys don't expect things to work with the new update immediately. Android 10 has a file system rehaul so stuffs gonna work differently. That being said I'm excited. I'm just sad I won't get to use desktop mode since our USB Cs arent new or powerful enough to use as an HDMI out *sadfate*

twinnfamous said:
I meant is it T-Mobile or international?
The T-Mobile one is most likely going to be difficult
Click to expand...
Click to collapse
Oh, it's International, unlocked.

usaid.shafqat said:
Oh, it's International, unlocked.
Click to expand...
Click to collapse
Before you do any of this make sure you disable any magisk modules you may have
Do local upgrade method but don't reboot.
Then go to magisk and select modules click the plus and find twrp installer zip once that's done.
Choose install to inactive slot after ota
Then reboot.

twinnfamous said:
Before you do any of this make sure you disable any magisk modules you may have
Do local upgrade method but don't reboot.
Then go to magisk and select modules click the plus and find twrp installer zip once that's done.
Choose install to inactive slot after ota
Then reboot.
Click to expand...
Click to collapse
Hello, when you say to disable the Magisk modules, should you simply uncheck the modules installed in Magisk or press "uninstall" and "restore images" on the Magisk home page?

PàllGuizi said:
Hello, when you say to disable the Magisk modules, should you simply uncheck the modules installed in Magisk or press "uninstall" and "restore images" on the Magisk home page?
Click to expand...
Click to collapse
I never uninstall magisk and restore images. Because I allways keep magisk. I just select to remove modules on next boot because they cause me problems.
As long as u keep magisk u can flash twrp with magisk.

twinnfamous said:
I never uninstall magisk and restore images. Because I allways keep magisk. I just select to remove modules on next boot because they cause me problems.
As long as u keep magisk u can flash twrp with magisk.
Click to expand...
Click to collapse
I prefer to ask to be on, because some also do like this: uninstall Magisk (without reboot), installation of the update (still without reboot) Magisk installation from the manager and reboot! I know it's more for OTAs but in the end I found on the forums that some processes like that for any ROM.
Anyway thank you for your answer I will try now: D
Edit : It does not work for me, nothing starts and it tells me directly "Failure of the installation of the home system" when I try by the local upgrade I would do with twrp this does not matter

Let's just disregard this silly post please.
Thank you.
Incidentally, this might be a sound method for upgrading Stable Pie to Stable Q:
https://forum.xda-developers.com/showpost.php?p=80812793&postcount=12