I finally found a way to root this thing ;)
1. flash twrp with fastboot
2. directly reboot into twrp
3. go to "wipe" and click "format data"
4. then, in recovery simply go back (without reboot)
5. connect your oneplus 5 with pc and copy ...
oh thank you very much I'm trying this, but it seems that fly gps is a better app, you may know also somewhere to install the zip of that app? anyway I'm going to try to check for that app
EDIT: your solution worked perfectly thank you lordHelm...
Hello and thank you for sending me the information and links. Flashing the modified supersu worked and I am now rooted :)
Just a final question please...Before I received your reply I had flashed stock several times and tried different supersu ...
There is a flashable version of the app linked on there facebook-page.
Uninstall your version of Fake GPS and flash this version of the app. Go to the app-settings and mark the Root-Modus...
For me on version 4.8 xposed works very well!
I just noticed after some restart xposed not works.. Not a big deal. I restart the phone one more time or twice, and everything works.. I like 4.8. probably I could live with 5.0 also, but i have no t...