Bootlop / cannot enter TWRP from Bootloader Menu / Power button stuck

Hi guys,

I currently have some issues with my beloved N5. I try to be as specific as I can (therefore the text will be a bit longer) :D
First things first: My device is experiencing the well known "stuck power button problem".
But I also do have problems which are not related to that one (at least thats what I believe).

Overview:
CM 13.1
ElementalX Kernel
TWRP on 3.0.20

Main issue: I can not start my phone regularly. When not plugged in, it just does not respond at all.
If it is plugged in I can get into the bootloader with only pressing Volume down (because the power button is stuck inside). Weird fact #1: in bootloader the power button should work to confirm a specific task like Start, or boot into recovery but it doesnt. Also: the phone is steady in the bootloader and does not keep rebooting.

Therefore I wanted to perform a backup (nandroid or at least all media) and reflash my ROM to see whether it is more of a software issue. I tried booting into TRWP which is not working (device shuts down after Google logo (might be because of the power button issue?).
I know that I can flash the recovery again through adb or the Nexus ToolKit but obviously I want to save my data first.
As far as I know there is no option as adb pull or through the recovery to save those only being in bootloader mode, am I right?
Question: Can I dirty flash without losing data? If thats not the cure, what else could help?

Other facts to know: while running

Code:

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adb devices

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I get that the

Code:

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"adb server version (36) doesnt match this client (35): killing...

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but then:

Code:

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*daemon started successfully*

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(same in Nexus Toolkit).
If I continue with

Code:

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adb backup

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it says: no devices / emulators found. Altough the nexus toolkit (and fastboot devices) say:

Code:

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FASTBOOT: 03181238e07723e0 fastboot

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If you made it until here thank you for reading :good: and I would be even more pleased if someone could help. ;)

Best,
McRacoon

P8 LITE in bootlop with update at 0%

I tried several times to update P8 LITE to 6.0 by placing the firmware in a dload folder on the internal storage card it never worked it just says update failed.I looked for several firmwares none of them worked my build version was ALE-L21C432B199.I found one post that said rename the update.app to update.zip and install the firmware.I did that and it started the local update from internal storage and it restarted at 0% fu@#ng me in the a#@s and ruining my phone.
The phone got stuck in a bootloop of constant updating and failing at 0%..I tried to go with power+volume up and all the other versions it did nothing.I then conected it to fastboot for a reflash with minimal ADB+fastboot it could not flash **** because it had a locked bootloader it says phone locked in green letters.I cant unlock the bootloader when it's bricked because i don't know the Serial and IMEI for the unlock code procedure.I dont know i should even try unlocking since it's under warranty.I read all the posts i tried the sd card update but i seams that it's set on constantly failing that first update over and over again.Non removable battery makes it even more annoying.This is a simple thing that can be solved with a simple flash that i did on countless Sony and Samsung phones even with their pc suite.But this HI suite is worthless and does not support P8 LITE system recovery !!! so Im stuck in this hell for a simple bootloop.Huawei has no Flashtool or Odin so and no flashmode only fastboot mode that can't be accessed, this makes it even more idiotic.I highly doubt anyone can fix this