@domubpkm Yes, you are right. On Aquaris I used the File Manager to find the contact.db.
And I'm an 'idiot' :beaming_face_with_smiling_eyes:
I forgot to set visible all file in the Volla Phone Directory. Now I see it
Thanks again
@lsrb It would be after an OTA that you will lose your modifications. An over the air update works by downloading an entire read only image and replacing the current one. All of your user directories are safe but not the root file system below home/phablet.