How to install /e/OS in Gigaset GS290 from GNU/Linux

I created this post as aim to collaborate with the project and help those how are bought a Gigaset GS290 to test this great /e/ OS degoogle fork, and have been failed by using easy installer, but first I will let clearly that these steps are the steps I followed in order to set up the /e/ OS in my Gigaset. Requirement-system: GNU/Linux OS (in my case Fedora).** ADB & Fastboot library latest....

2021-03-21