[P8lite Q&A, Help & Troubleshooting] JpegXguy:
Everyone, I made this to go from the start. Follow this guide (also in txt form)

It's gotten to this. You've tinkered with your phone and it's got into a bootloop, also known as a softbrick. Have no fear though, for software problems are much easier to solve than hardware issues. If you have the latter, pray and get in touch with the place you bought your phone from or Huawei themselves. Let's start booting.

Yeah, you could use the numerous scripts in XDA to automate some stuff, but you won't learn much that way. I've found that a) adb and fastboot are really easy programs that Google has provided us with to solve issues/develop and b) their knowledge helps with problemsolving for Android in general. It's good to know your phone. That's the open nature that iOS cannot achieve.

1. Getting the SDK Platform Tools (adb, fastboot e.t.c.)

You can always get the latest SDK Platform Tools .zip by clicking on the link for your OS: Windows, Mac, Linux.

Extract the .zip's contents in a folder. (I trust you know how, even phones can do it nowadays... Anyhow, you can get 7-Zip for Windows, as the built in zip manager is limited)

2. Using the SDK Platform Tools

You give commands to adb and fastboot though a command window.

You have 2 choices. You can either:

a) work from the folder you extracted the sdk tools in (I have them in D:\Portable\platform-tools).

You'll have to do [Shift] + (Right click) > "Open command (or PowerShell) window here"

[IMG="Open command window here (sorry for Greek)"]http://i.imgur.com/KxIY2zK.png[/IMG]

or

b) edit your PATH environment variable, so you can open a command (or PowerShell) window anywhere you want.

Call the program by name to give commands (e.g. adb <command>)

[IMG="Calling adb trough the command prompt"]http://i.imgur.com/lFSlncT.png[/IMG]

3. Getting into fastboot/bootloader mode

You can do that in 3 ways:

a) Shut down the phone. While holding VOL- (down), connect a USB cable that is plugged to a power source (usually your PC, since you are planning to use the fastboot program).

b) We'll use the adb utility.

You need to enable USB debugging for this. After that you can refer to "chapter" 2.

Type

and press [Enter].

c) Reboot into a custom recovery like TWRP and go to Reboot > Bootloader

4. Flashing the stock images

Here's the part we care most about, to get out of the bootloop.

If you are truly in fastboot mode, with the green android dude (his name is Andy) and the white background then the command

should return your device's serial number. Then you can go ahead and flash the 4 needed partions from the stock ROM with fastboot.

First of all, you need the 4 .img files for boot, recovery, cust and system.

You can get these as follows:

This page lists all the Huawei Firmware for the ALE model, aka our P8 Lite (Thanks [MENTION=5218324]persona78[/MENTION] for the link, see here). You can translate to English with the Google Translate toolbar on the top. Find a firmware package of type FullOTA and click on the update link to download the zip update file. Inside that zip is the UPDATE.APP file we need, so extract it somewhere.

Use Huawei Update Extractor to extract boot, recovery, cust, and system as .img files.

Open a command window in the folder with the files and rename them accodingly if you wish (e.g. 06.boot.img -> boot.img)

Then you can flash them in fastboot mode by executing these commands 1 by 1. They're pretty self-explanatory.

That last one may take a bit. Then you can do