@advocatux Thanks again for your support.
Not at the first run, but after some trials I finally got my Aquaris E5 back again!
I'm so happy! 
Also helpful were the following links:
https://wiki.ubuntuusers.de/Ubuntu_Touch/flash_tool/
https://forums.ubports.com/topic/1025/ubports-for-bq-e5-all-you-need-to-know/10
For me the issue is fixed and can be closed.
@advocatux Thanks again for your support.
Not at the first run, but after some trials I finally got my Aquaris E5 back again!
I'm so happy!
Also helpful were the following links:
https://wiki.ubuntuusers.de/Ubuntu_Touch/flash_tool/
https://forums.ubports.com/topic/1025/ubports-for-bq-e5-all-you-need-to-know/10
For me the issue is fixed and can be closed.
@advocatux Thank's for your answer. I didn't try the image because the file inside is named "MT6582_Android_scatter.txt". I had doubts about the "Android". I think the BQ E5 Ubuntu Edition and the E5 Android version has different hardware.
Does the platform MT6582 indicates Ubuntu Edition or Android?
What could happen if I use the file? Can it cause an "irreparable" situation?
Sorry for my doubts, I just want to avoid a damage.
By the way: I can't use the recovery mode. It freezes in the BQ-logo.
Hello,
I want to post a problem which is similar described in some other posts with different circumstances, but I haven't found an answer there, so I open a new post.
A similar problem can be found in this post:
https://forums.ubports.com/topic/2924/solved-can-not-install-ubports-on-krillin-again
I also wanted to reinstall UBports via the UBPorts Installer.
The installer said "Done It is nor safe to unplug the device".
But the phone won't boot, it shows the BQ-logo, nothing else.
So I tried to solve the problem according to the link above by flashing an old image with SP_Flashtool.
Unfortunately I can't find the correct image for the BQ Aquaris E5 Ubuntu Edition.
The link of the troubleshooting site contains the Android version.
https://docs.ubports.com/en/latest/userguide/install.html#troubleshooting
https://storage.googleapis.com/otas/2014/Smartphones/Aquaris_E5_HD/Ubuntu/VEGETA01A-S11A_BQ_L100EN_2017_170207.zip
This site contains a dead link:
https://www.mibqyyo.com/topic/82828/firmware-ubuntu-15-04-ota-14-para-aquaris-e5-ubuntu-edition
https://www.mibqyyo.com/descargas/categorias/aquaris-e5-ubuntu-edition/
Where can I find the correct file?
Thanks in advance!