Using Honor 9 after EOL / Unlock bootloader / Flash custom rom - Honor 9 Questions & Answers

Hi everyone,
since Huawei apparently dropped support for the Honor 9 a while ago, I'm getting concerned of my phone being a security risk as the Android security patch is of july 2019.
As my 3-year-old phone is still working totally fine, I was checking out my options to flash a custom rom.
Unfortunately, I had no luck unlocking the bootloader with dc-unlocker as I was not able to get my phone detected. (I assume it's due to the fact that I'm running EMUI 9.1?)
What are my options here? Would a downgrade to EMUI 8 allow me to unlock the bootloader? Is such a downgrade even possible? Any other way?
And if an unlock would be feasible, are there any maintained custom roms such as lineage, openKirin or /e/?
Kind regards,
j

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i have the same problem
the bluefrag security hole alone is a biggie...
as i understand it there are some (chinese?) channels where u can pay for an unlock code or something
OpenKirin would run once we get the bootloader unlocked
the community for this phone here on xda is really inactive i guess
one would have a better chance to look at chinese forums maybe?

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Now really got bootloader code with test-point and flash board firmware. Then use HCU .

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If you are looking to unlock the bootloader of your Hauwei device with kirin processors, look into the potatonv method. I hope that I have permission to link to github from here. This is not my work, so all acknowledgments and appreciation should go to the guy/lady who made this. Find the link to download the app (Windows only) below:
https://github.com/mashed-potatoes/PotatoNV
To be able to use this method you must be able to access your device hardware testpoint node and short it by hooking a metal pincer between it and a motherboard plate on your device.
Of course, this means that you must open the back cover of your device. Once the testpoint is exposed, short it and hold for some seconds, maybe even 20 or 30s. Then plug your device to your Windows computer and you will notice HUAWEI USB 1.0 driver getting installed. Once that is completed, you are good to go.
Simply launch the potatonv app and your hauwei device will be detected as a hauwei usb device, which is the target device. Choose your processor, your device shoul be among those listed below. Then click on START and wait for the process to complete.
Note that you require a Windows computer for this, with Windows 7 and above, with updated .NET framework. Be sure to check out the devices listed below to know if this method will work for you. However, if your device is not listed below, you may try any of the options of Kirin 65x (A) or (B) in the bootloader option as seen in the app. Also, if it is successful, save the unlock code that is shown, as this will become your unlock code if you ever need one in the future for whatever reason. For me, since that was to be the case, I chose my 16 digit number.
This method is known to work on the following devices:
Honor 5C / 7 Lite NEM Kirin 65x (A)
Honor 7X BND Kirin 65x (A)
Honor 8 Pro / V9 DUK Kirin 950
Honor 8 FRD Kirin 950
Honor 9 Lite LLD Kirin 65x (A)
Honor 9 STF Kirin 960
Huawei Mate 9 Pro LON Kirin 960
Huawei Mate 9 MHA Kirin 960
Huawei MediaPad M5 Lite BAH2 Kirin 65x (B)
Huawei MediaPad M5 CMR Kirin 960
Huawei MediaPad T5 AGS2 Kirin 65x (A)
Huawei Nova 2 PIC Kirin 65x (A)
Huawei Nova 2i / Mate 10 Lite RNE Kirin 65x (B)
Huawei Nova 2s HWI Kirin 960
Huawei P Smart 2018 FIG Kirin 65x (B)
Huawei P10 VTR Kirin 960
Huawei P20 Lite / Nova 3e (!) ANE Kirin 65x (A)
Huawei P8 Lite (2015) (!) ALE Kirin 620
Huawei P8 Lite (2017) PRA Kirin 65x (A)
Huawei P9 Lite VNS Kirin 65x (A)
Huawei P9 Standart EVA Kirin 950
Huawei Y9 (2018) FLA Kirin 65x (A)
I hope you find the above helpful