[OnePlus 9 Pro] enoironline:
Hi everyone, please excuse if my post has spelling mistakes, it's electronically translated into English from my native language. I am new here and may never be able to contribute again because I actually have no idea at all with changing smartphone operating systems and it was the first time I did anything like this. However, I really wanted to have the LineageOS for MicroG on my device, so I took a total of about a week to read up on the subject, watch Youtube videos and acquire the necessary knowledge to achieve my goal.

About my goal;

I successfully installed LineageOS MicroG 18.1 (version 2021.12.20) on my Oneplus 9 Pro today, without any significant problems and right on the first try. My approach is based on gathering various information that I found on forums, websites and Youtube. At this point already a big thank you to all who are responsible for the creation of the following mentioned instructions or videos.

Hardware;

For my project I finally used the following:

- My new Oneplus 9 Pro, LE2123 (European version)

- a Windows 10 PC with USB 3 ports

- A USB 3 cable (USB A to C)

Software;

I used the following software:

- cmd from Windows

- ADB and Fastboot: platform-tools_r31.0.3-windows.zip

- Updates of ADB and Fastboot (see reference to Youtuber below)

- Update of Qualcomm Drivers (same youtuber as for the ADB update)

- File copy-partitions-20210323_1922.zip

-LineageOS for MicroG recovery image file

- LineageOS for MicroG main file in .zip format

You will find the various files and programs via links on the manual pages of LineageOS, LineageOS for MicroG, via the links of the Youtube videos and via Google.

The use of the TWRP software was not necessary.

Instructions;

The following instructions I used or were important for me in this order to understand what I had to do, but not in the order to install LineageOS (for MicroG)(!):

1.) the main LineageOS for Oneplus 9 Pro lemonadeap guide (Link) (LineageOS for MicroG refers to this guide, see here ). Even if it would never have been enough to reach the goal, it was important and somewhat conclusive together with the following instructions.

2.) The Youtube video of Unstoppable Tech LINEAGE OS ON ONEPLUS 9PRO 🔥🔥🔥 || INSTALLATION + WITHOUT TWRP!!! #linegageos #ONEPLUS

Alone this tutorial would never have been enough to get to my goal, but was a very good addition and explanation to the main LineageOS tutorial.

3.1) The Youtube Video from NKT Studio How to Install ADB on Windows 10 // ADB Drivers or Plaform Tools Install Windows 10

3.2) The Youtube Video from TechiBee Fix Fastboot/Adb & Qualcomm drivers (Unbrick tool) not detecting on Windows 10/11

In the preparation of the Windows 10 computer, this videos were very helpful!

4.) The Youtube video from Mental Outlaw How to Install Lineage OS to Oneplus 7 Pro

While this video was not goal oriented in installing LineageOS because he used the TWRP software for the 7 Pro, it was basically very informative and made me familiar with the various displays during installation. Don't be put off by the fact that he uses TWRP, it's not necessary on the 9 Pro. The steps before and after using the TWRP software were similar in the installation on the 9 Pro.

Procedure;

And now for the installation, I recommend you to proceed as follows:

1. watch the above videos in detail and read the manuals carefully. You must be familiar in advance at least with what is coming.

2. update Windows 10 to the latest version.

3. download all the software packages already mentioned

4. for me it didn't matter at all that I used a USB 3 cable and a USB 3 port.

5. set up ADB under C:

6. put from the beginning the three files

- copy-partitions-20210323_1922.zip

- the LineageOS for MicroG recovery image

- and the LineageOS for MicroG main file

into the adb folder under C:

5. make sure from the beginning that your Oneplus 9 Pro is recognized by adb AND Fastboot! Only after I updated the ADB drivers according to NKT Studio and also the drivers from Qualcomm, Fastboot recognized my device. Only after that I could run the command fastboot oem unlock. I guess that i didn't get any problems because i updated the adb drivers and also the Qualcomm drivers.

6. stick to the order of the manual.

Edit - PS: do NOT LOCK THE BOOTLOADER after hafe finished the installation. If you du it the Smartphone will stop to run / it will shop up a message, that the device is compromised and can't be booted anymore. "More Infos on g.co/ABH" .

I was able to stop the loop message pressing Volume UP and DOWN simultaneosly and so to bring the device in the emergency download mode. Over adb re-unlock fastboot tiping "fastboot oem unlock" and the device will restart LineageOS. It will vipe away all your datas, but the device will finally work fine again.

I hope my post can be helpful to someone.

Greetings, happy holidays and stay healthy.

Mike