[Huawei P30 Questions & Answers] MrMutlu:
Hi, I want to unlock bootloader of my phome and root it via Magisk method. But recently I've discovered that there is no way to unlock bootloader when you upgraded to EMUI 11. Dc-Phoenix + HCU doesn't support after EMUI 10 software testpoint. So the only way is try to Hardware testpoint method. I disassembled the phone and reach the motherboard and testpoint pin without damaged it. I short the testpoint pin with metal ground, plugged the USB and managed to enable the testpoint mode (the screen was black.) But then I saw my computer cannot detect my phone in testpoint mode, there is no "Huawei USB COM 1.0" or "USB Ser". I find drivers for Huawei USB COM 1.0 but still no change at all. I check the "Device Manager -> Install Legacy Driver -> Install From Disc" but there is no Huawei Incorporated drivers. I think my PC's problem that cannot detect my device in testpoint mode is the drivers. Here is what I did step by step;

1- Battery fulled and power off, phones back cover removed carefully and reached the mothet board. Testpoint pin founded.

2- Huawei USB COM 1.0 drivers installed to PC (driver file from PotatoNV GitHub page.)

3- USB-A side plugged to PC and USB-C side is waiting

4- A conductive metal tool (mine is pointed tweezer) grabbed and shorted to pin to metal ground and I keep them so.

5- While keeping the testpoint shorted, I plugged the USB-C side to phone and waited couple of second.

Then when I look at the PC, there is no change. No device detected. First, I was think that I couldn't manage the testpoint shorting but when I plugged the Phone to PC without shorting, the Huawei boot screen appears. When I short the testpoint and plugged it, the screen is black which means the device is in test point mode. But then, PC is not detecting my phone. So my guess is that the problem is the drivers.

EDIT: I find out I could use the HiSuite Proxy app to downgrade from EMUI 11 to EMUI 10 so I can use the DC-Phoenix + HCU, but I tried this method before disassembling the phone. It didn't work that time. 2 days ago, I tried again this method to downgrade and use the software testpoint and I successfully downgraded it. The problem was HiSuite 10.0.0.550 cannot flash EMUI 11 but HiSuite 10.1.... can flash EMUI 11. I was in 11.0.0.159 firmware version and downgraded to 10.1.0.150 firmware version.

After that day, I decided to start to unlock method by DC-Phoenix and HCU but before buying timed licence I want to be sure that everything is okey. First, I plugged to phone to PC and that is the end of the way. There is no way to connecting PC after downgrade. I searched it from XDA and find out that after some security patchs or firmware versions if you try to downgrade, your USB activities are locked. And when you reach to latest version (version before I downgrade from), USB problem is solved. This is about the Huawei's new security patch, I guess. Many of Huawei P40 user is complaining about same problem. They are telling that in P40 after 11.0.0.180 update, if they try to downgrade, there USB functions are limited (no fast charge, no OTG or USB driver, no PC connecting). So, if you're using your Huawei phone and you are in EMUI 11 and after some update you will be get this problem too. There is no way to unlock bootloader or root on EMUI 11. There is no way to downgrade. But I searched and find out that you can flash any stock rom by SigmaKey. It is very expensive but you can flash stock rom to downgrade. You need just dload files (that 3 zips) and unzip the update.app and ptable.app files. Do that for 3 zip packages. And you can flash roms without any problem.

What I tried and discovered is dload method won't work this USB problem. Everyone knows that you can't downgrade from EMUI 11 by dload method. I downgrade with HiSuite Proxy to EMUI 10.1.0.150 and after downgrade I tried to dload method to upgrade firmware to 10.1.0.161. Dload is failed in %94 and I restarted device. The version is upgraded to 10.1.0.161 and all user data formatted but USB problem is not solved. When I upgraded to latest firmware, the problem is solved. But I want to downgrade without any problem and root this phone.

My biggest advice to anyone who have the Huawei phone, DO NOT UPGRADE YOUR PHONE WITHOUT SEARCHING THE NEW VERSION. IT IS LIKE HUAWEI FORCING EVERYONE TO UPGRADING THERE PHONE OR CANNOT DOWNGRADE TO ANY FRIMWARE.

Does anyone has same problem with me? What is the solution for this? I removed the back of the phone for nothing. I have to unlock the bootloader and root this device. I would really appreciated if you can help me.