Hi,
I suggest trying to unbrick using Windows : /e/ installé avec easy installer sur GS290... le téléphone ne démarre plus - #17 by smu44
Windows 7 ISO download : https://download.microsoft.com/download/C/0/6/C067D0CD-3785-4727-898E-60DC3120BB14/7601.24214.180801-1700.win7sp1_ldr_escrow_CLIENT_PROFESSIONAL_x86FRE_en-us.iso (trial period should give you enough time).
I think that VirtualBox or VMware Workstation Player should work, as long as you give the VM access to USB ports (VirtualBox) or access to USB ports (VMware).
When done, you could resume openSUSE trial 
Alternatively, if you live in E.U., you can contact me privately.