How do you clone an android device, specifically One Plus 3T? - General Questions and Answers

Hi,
I have a working environment setup on my OnePlus 3t phone and i have a completely new backup phone(same model).
None of the phones are rooted.
Oxygen OS version 9.0.6
Android version: 9
Build number: ONEPLUS A3003_28_191104
Model: ONEPLUS A3003
Can someone give any guidance into what steps should i take to make an exact copy? so if one phone breaks i could simply switch sim cards and boot the replacement one.

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My friend got ripped off and got a fake iPhone 7 Plus with android installed. Actual Model Number of the phone ZECHIN6580_WEG_M Android 6.0.
He wants to flash a stable android OS version because the one installed is a non stable version.
If anyone can help him please reply here.

Rooting Oneplus 8 on Oxygen OS 12

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Stable Android 11 - OP 7 Pro (GM1915)

Hi All,
I have a OnePlus 7 Pro GM1915 that I converted from T-mobile to Global. I came from a OnePlus 6T and it had the official Android 11, the problem is I updated using OTA updates and then using the Oxygen Updater but the Android 11 was extremely buggy.
The screen would zoom in and wouldn't work until I restarted my phone. I am starting to regret my decision of going on the OnePlus 7 Pro.
Can someone please help me find a stable Android 11 where everything works?
The GM1917 version has the Oxygen OS11.GM21AA that has none of the issues. Is there anyway I can have that flashed.
I don't want to root my phone because then some of my banking apps don't work.

fingerprint is not registering on customs rom (partially finger detected )

hi all,
i need help for my device
i bought my oneplus 7 second hand in perfect working conditon. then i updated to android 12 for a try but
it feels slow so i used msm tool and downgraded to android 10.3.8 as i only find android 10.3.8
not android 11 based oxygen os 11.0.9.1 for msm tool then
using system updater i updated to android 11.0.9.1. now in all stock rom i can registered and use fingerprit
to unlock my device but in custom rom android 13,12,11 i cant registered fingerprint (partially finger detected) .
but only android 10 custom rom it work and in all stock rom it works. i want to know what is the reason
that my finger print not working in custom android 13,12,11 roms. i tried lineage os and pixel os on xda.
Note - i dont know if this happens from me while upgrading or downgrading
or not as i bought it in used and perfect like new condition.
device = oneplus 7 6/128 indian
Currently on = oxygen OS 11.0.9.1 GM57AA (all is working perfectly including fingerprint)
thank you in advance and sorry for my bad english

Stock OS Upgrade

Has anyone upgraded to the following android version.
GM1911_11.H.37_4370_202301302310
For the OnePlus 7 Pro?
Im currently on GM1917 11 H.31 and it seems like the closest thing to a stable android on the OnePlus 7 Pro. I don't want to ruin that or setup my phone from scratch.

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