Transition from HydrogenOS to Oxygen The phone does not respond - OnePlus 7 Pro Questions & Answers

hello i installed HydrogenOS on my 7pro. I wanted to go back to oxygen os. I unlocked blootloader, but my screen crashed when trying to install twrp. Only the oneplus logo and "fastboot mode" are shown. I am an amateur, so please bear with me and I would like to go back to oxygen os
edit.
I managed to start the phone but how to install twrp on hydrogen os android 11 to return to oxygen os

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tried to install TWRP on chinese OP6, does not boot

Hello everybody,
I am currently in china and bought a new Oneplus 6 there. Unfortunately it comes with HydrogenOS installed here in China. I unlooked the bootloader without problems.
For installing the TWRP recovery i used this guide (https://forum.xda-developers.com/showpost.php?p=76635744&postcount=148).
However after i flashed the recovery (there where no error messages in the command promt), I tried to boot into the recovery. But now it seems that the TWRP Recovery is stuck... It stays at the boot screen. (even after a wait of 15 mins)
Is this guide not correct for a H2-OS Oneplus 6? What can I do now? I would be happy about every help i can get
Thank You!
It's not for HydrogenOS, coz now recovery is part of boot.img so when you flash it you brick your hydrogen .
You should flash the last official oxygen with fastboot after a wipe and then restart from scratch with OxygenOS
There is a topic with that ROM...

Couldn't install any GSI

Recently I did unlock bootloader of my violet. I had the miui 10.3.12.0 . I can install and boot ROMs like pixel experience,lineage os etc but couldn't boot GSI. I did follow each and every steps through tutorials.
I tried oxygen os,I got no os installed and I flashed the patch file later I did get OnePlus boot animation but after an hour it didn't boot at all. Same thing happened when I tried to install Xiomi EU. Please anyone guide me.

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My dad's phone came from PE 11 and now we attempted to return to stock by using xiaomi flash and the latest india rom 12.0.5.0 and to my mistake I ticked flash and lock cause I assume since this is violet then there would be no problem. And now it is locked and it keeps on looping on a menu I think this is xiaomi recovery mode and it shows on the button
"This MIUI version can't be installed on this device"
It is so weird because it is a violet device. Im really toast hope someone can Help
Which ROM you used to flash ? give link
Try this post,
hopefully that solves.

cannot upgrade android version to android 9

hi all
my Xiaomi phone (SDM 845) was flashed custom Oxygen os and bricked my phone.
Now i cannot install miui stock firmware android 9 and 10 .
Everytime i install fastboot firmware android 9 , android 10,
get stuck into Bootloader.I tried <Wipe /format > in recovery ,but did not boot to system.
always loop into fastboot mode.
Only android 8.1 rom boot to system successfully.
I cannot upgrade to pie and Q rom.
help me .

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