Install /e/ on a Gigaset GS290 - “GS290”

Tip: Please read through the instructions at least once before actually following them, so as to avoid any problems later.
Caution: Flash your device only if you know what you are doing and are OK taking the associated risk. The /e/ project and its project members deny any and all responsibility about the consequences of using /e/ software and or /e/ services.


  • Take a backup of all important data on your phone before proceeding.
  • Ensure your phone is charged more than 50%
  • Check that adb and fastboot are enabled on your PC. If not you can find the setup instructions here
  • Download all the files and images mentioned in the download section below before starting the installation
  • Make sure you have a working data cable to connect your device to the PC. There are cables which are only for charging and do not transfer data.

  • Enable USB debugging on your device. You can find the instructions here
Caution: Before following these instructions please ensure that the device is on the latest Android firmware. For example to install to /e/ Q the Android firmware should be Android 10 and for /e/ Pie it should be Android 9

Downloads for the GS290

Warning: Please note some of the above links can lead to external sites

Before install

  1. If you already have a non android OS like UbuntuTouch on your GS290, follow the instructions given here before proceeding with the rest of the installation

  2. Ensure you are on Android 10: Before installing /e/ on the GS290, kindly be sure it is on Android 10 stock ROM. Info is visible in Settings, and update should be available OTA if it is still on Android 9.

Before installing /e/ on the GS290, kindly be sure it is on Android 10 stock ROM. Info is visible in Settings, and update should be available OTA if it is still on Android 9.

$ fastboot --version
fastboot version 30.0.5-6877874
  1. Check fastboot version

     fastboot --version
     fastboot version 30.0.5-6877874
    Caution: Versions provided by Ubuntu or some operating system are not up to date, do not try to flash your Gigaset with it. Instead, follow the instructions given here
  2. Enable developer mode and following the instructions given here

  3. Unlock your device

    Caution: Unlocking the bootloader will wipe out all your data. Ensure you have taken a backup as mentioned in the Requirements section above.
     adb reboot bootloader
     fastboot flashing unlock
  4. On your phone screen confirm by pressing volume up

Install /e/

  1. Download and extract the /e/ ROM

    You can unzip the files into the folder where you copied the fastboot files.

    Alternately you can create a folder and unzip the ROM there.

    In the second case the below commands will need the path to the folder where you unzipped the ROM files.

  2. Download boot.img and recovery.img next to system.img file
  3. Reboot in bootloader with adb reboot bootloader
  4. Press volume up on the smartphone
  5. Run the following commands to install /e/
  fastboot flash --disable-verity --disable-verification boot boot.img
  fastboot flash recovery recovery.img
  fastboot flash system system.img
  fastboot -w
  fastboot reboot
To find some troubleshooting tips… click here


  • Getting a Total xFer ':' 0.01x message - Try to upload the /e/OS to internal storage and retry to install
  • adb ':' sideload connection failed ':' insufficient permissions for device error - Try to execute the commands adb kill-server and adb start-server and retry
  • Running adb shell twrp install /sdcard/</e/ zip package> raise non-existent directory error - Try to check solution here
  • Getting an insufficient permissions error - Try the solution given here
  • When running "adb devices" in bash a device is shown as "unauthorized" - Try the solution given here


  • Errors while running TWRP version 3.4.x.x or above - Try downloading and using a previous TWRP version.. below 3.4.x.x
  • In TWRP if this error shows up failed to mount /preload - Try in TWRP wipe screen in advanced menu select preload and swipe to wipe
  • /cache/recovery/xxx -> no such file or directory error while flashing a ROM - On PC run adb shell in the console now create a folder called recovery for e.g. here the devicecode name is violet "violet :/cache# mkdir recovery"

Tip: If you need help following this procedure or want to discuss any modification to it, please visit our dedicated topic on our community forum