[OnePlus 9 Pro] dazuk9269:
Hi Peeps,

Further to my issue within thread >> https://xdaforums.com/t/bricked-oneplus9-pro-unlocked-options-for-newbie.4577539

Listed below is how I/we overcame the fastboot constant boot issue. A little background in case someone comes against the same issues.

I bought a OnePlus 9 Pro in the hope to have a degoogled phone. Following the lineageOS instructions I somehow corrupted my device and when issuing Volume Down & Power got stuck in a fastboot loop.

Failed Resolutions:

1/ MSM

Part of the resolutions mentioned usiing the MSM tool (windows only) However in my case, My windows vm only recognised my phone has a Android Phone nothing else. I should also point out it couldn't go into edl(Both volumes+power) either. Probably why not recognised as OnePlus 9 Pro by windows.

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2/ Fastboot & Extract payload.bin .img files) & Fastboot Enhanced tool

a/ https://droidwin.com/unbrick-oneplus-9-pro-fastboot-commands/

b/ https://xdaforums.com/t/tool-windows-fastboot-enhance-payload-dumper-image-flasher.4310553/

Both methods needed to reboot in fastbootd mode unfortunately my phone failed with both methods. Got a message regarding failing to boot into userspace

These methods possible would work if windows could recognise the phone/edl is functional.

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(Thanks to @TheGhost1951)

Successful Resolution Below - Big thanks goes to @immortalwon

TWRP Method:

https://xdaforums.com/t/recovery-3-...twrp-with-a12-a13-encryption-support.4523857/

Download link: https://drive.google.com/drive/folders/1MXANZupY0c08n3AZsmqmLJ-isbRYev6m Download from the latest folder.

Official Firmware OnePlus 9 Pro Link: https://oxygenos.oneplus.net/OnePlus9ProOxygen_22.E.13_OTA_0130_all_2111112110_8b4d5c8737d04612.zip

Prerequisites:​

1/ platform tools installed & path set. (works both on windows/linux) I finished mine on linux due to vm usb issues.

2/ fastboot devices recognises your device,

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Initially not entirely sure if this next step was still required or maybe the 2nd option(renaming & moving .img into platform-tools folder) will suffice? maybe someone can advise? I just know it worked for me;)

1/ Extract zip from above download link to folder.

2/ Issue fastboot boot boot-oos13-firmware.img

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After completion my phone had the below options

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After clicking reboot & sliding to confirm as advised went into fastboot mode,

Final Successful Method:

1/ Rename file boot-oos13-firmware.img to twrp.img

2/ Place twrp.img inside your platform tools folder.

3/ Now from the command prompt, type this exactly: fastboot boot twrp.img

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After completion we had a lot more options within TWRP as below:

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1 Now click on advanced, adb sideload and swipe right. If you see options Wipe Dalvik Cache & Wipe Cache DO NOT SELECT!

2/ Move official OnePlus 9 Pro firmware into platform-tools folder & rename to a shorter name, I renamed to twpr.zip

3/ Issue adb sideload twrp.zip (During this stage I moved to my local linux machine as vm wasn't playing nicely with usb.

May see some errors on successful completion.

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Upon Reboot Happy Days!;)

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Sorry not really a writer as you can probably tell;) Thanks for all the guys who assisted me. Happy to report I now have a fully functional LineageOS de-ggogled phone;) I hope this helps someone in the future. Thanks Daz

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