Unable to open 7z-Archive: Open ERROR: Can not open the file as [7z] archive

I'm trying to open a 7z-File which I've packed with my phone using the ZArchiver app. Probably the process was interrupted and some files have gone missing, but that's not a huge problem. Ark and file-roller can't open it. [qohelet@localhost che]$ 7z e Cambulera.7z 7-Zip 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21 p7zip Version 16.02 (locale=de_AT.UTF-8,Utf16=on,HugeFiles=on,64 bits,8 CPUs Intel(R) Core(TM) i7-4710MQ CPU @ 2.50GHz (306C3),ASM,AES-NI) Scanning the drive for archives: 1 file, 1400666544 bytes (1336 MiB) Extracting archive: Cambulera.7z ERROR: Cambulera.7z Cambulera.7z Open ERROR: Can not open the file as [7z] archive ERRORS: Is not archive Can't open as archive: 1 Files: 0 Size: 0 Compressed: 0 This is not working either: [qohelet@localhost che]$ 7z e -so Cambulera.7z > raw ERROR: Cambulera.7z Cambulera.7z Open ERROR: Can not open the file as [7z] archive ERRORS: Is not archive I've found on https://www.7-zip.org/recover.html some basic 7z-recovery hints, but it's not helpful. Opening it with a hex-editor is giving me the exact output as expected: I wonder it's so difficult. Most archive-formats are relatively robust? I'm using Fedora. EDIT 1: Das Paket p7zip-plugins-16.02-13.fc29.x86_64 ist bereits installiert. Abhängigkeiten sind aufgelöst. Nichts zu tun. Fertig. [qohelet@localhost che]$ 7z t Cambulera.7z 7-Zip 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21 p7zip Version 16.02 (locale=de_AT.UTF-8,Utf16=on,HugeFiles=on,64 bits,8 CPUs Intel(R) Core(TM) i7-4710MQ CPU @ 2.50GHz (306C3),ASM,AES-NI) Scanning the drive for archives: 1 file, 1400666544 bytes (1336 MiB) Testing archive: Cambulera.7z ERROR: Cambulera.7z Cambulera.7z Open ERROR: Can not open the file as [7z] archive ERRORS: Is not archive Can't open as archive: 1 Files: 0 Size: 0 Compressed: 0 [qohelet@localhost che]$ 7z l Cambulera.7z 7-Zip 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21 p7zip Version 16.02 (locale=de_AT.UTF-8,Utf16=on,HugeFiles=on,64 bits,8 CPUs Intel(R) Core(TM) i7-4710MQ CPU @ 2.50GHz (306C3),ASM,AES-NI) Scanning the drive for archives: 1 file, 1400666544 bytes (1336 MiB) Listing archive: Cambulera.7z ERROR: Cambulera.7z : Cambulera.7z Open ERROR: Can not open the file as [7z] archive ERRORS: Is not archive Errors: 1