[Honor 6, 6 Plus Android Development] jhettler:
Hi guys,

self reply. I got through it. It was not completely without troubles, but finally I have Android 6.0 with EMUI 4.0.1 (build PE-TL10C432B571) in my PE-TL10 (originally on Android 4.4.2, EMUI 3.0, build PE-TL10V100R001CHNC00B260). I don't need a ROOT and custom recovery now so it is unrooted and stock recovery now.

First, I have never rooted Honor 6 PLUS and as it is not the newest device and it is not fully supported anymore by Honor MultiTool you have to use another way.

Bootloader has to be UNLOCKED - I used the MultiTool - it's fine and without any troubles

Device has to be ROOTED - that was a bit issue, because you have to flash custom recovery to be able to flash SuperSU and root the device. I did it via fastboot.

To enter the bootloader mode (fastboot) just switch off device, then hold Vol- and plug the USB cable - it should enter the bootloader mode - you should see the android robot and "phone UNLOCKED" indication.

Now you can use fastboot commands (you have to have proper drivers installed, you can find instructions on in another threads on XDA).

Or you can enter bootloader mode with command "adb reboot fastboot" - you have to be in the system (running Android) on the phone to run adb commands. It will restart your device and enter the bootloader mode after restarting.

Once you are in the bootloader mode with UNLOCKED bootloader you can flash custom recovery (necessary to flash SuperSU). I had to flash the proper custom recovery which I found here . I tried to flash another TWRP and CWM recoveries, but without success. You can flash the recovery with fastboot command "fastboot flash recovery CWM.img".

Then you can restart the device into the system with "fastboot reboot". Once you are in the system, you can reboot into recovery with command "adb reboot recovery".

In the recovery choose "install ZIP from ..." and choose this file. I had to choose the version BETA-SuperSU-v2.42.zip otherwise it didn't install anything despite the installation process was successful.

After the successful installation of SuperSU, you should have ROOTED device. You can check it for example with Root checker.

Then I mostly followed this tutorial. But with few modifcations.

I couldn't find this /dev/block/platform/hi_mci.0/by-name/oeminfo folder in my phone so I had to change the command for terminal emulator in the phone to dd if=/sdcard/oeminfo.img of=/dev/block/platform/ff1fe000.dwmmc0/by-name/oeminfo. There is another folder in "platform" folder but it doesn't contain "by-name" folder.

Then the tutorial says Press Vol-+ and Power to install the European update.app and we will have turned the PE-TL10 Chinese in European, but the issue is, you can't enter the "download mode" after you installed custom recovery. It simply doesn't enter the "download mode" and it stays on the screen with honor logo.

It was necessary to get into the system to be able to use fastboot command to flash stock recovery. How to solve it. I could't enter the system anymore, but I could enter the CWM. So I wiped the data and cache through CWM (Vol+ and Power button) and I was able to enter the Android system again.

I used again the "fastboot flash recovery B250.img" and flashed this recovery. It didn't correspond with my build version B260, but it helped.

Then I restarted the phone, entered again the system and through "Settings - Updater - Menu - Local update" and choose the "UPDATE.APP" from "dload" folder (it should be automatically detected) and whoila, it should restart the device and load "download mode" and install the UPDATE.APP. You should be able to do this step with Vol+- Power button combination instead of doing it through "Settings menu". And that's all.

I rather added some of used files into the attachment