A password will be e-mailed to you.

After the latest round of firmware updates went out for the SL2 and SL2-S earlier this month, users with APO-Summicron-SL prime lenses noticed a delay when shooting those lenses stopped down. Reports piled up with more and more users reporting the same issue. Today, Leica has released a revised set of firmware files for the SL2 and SL2-S that fixes this bug. Now, the SL prime lenses work properly. Install by clicking the download links and following the directions below, or update through the Leica FOTOS app connected to your camera.

Firmware Files

To download the firmware file, simply click the button below. You'll need to drag and drop the downloaded firmware file onto an SD card which was freshly formatted in the SL2 / SL2-S, then insert the card into your camera with a fully charged battery. Navigate to the Camera Information menu to access the firmware update option. Don't try to open the firmware file on your computer – just copy it onto the SD card into the root directory. Full step-by-step instructions are below


Download Leica SL2 Firmware v4.1


Download Leica SL2-S Firmware v3.1



Installation Instructions

  1. Recharge the battery to 100% and insert the battery into the camera.
  2. Remove all SD cards from the camera.
  3. Prepare a SD card for installation:
    a. It is recommended to format the memory card inside the camera.
    b. Please make sure that the card contains at least 200 MB of free disk space.
    c. Copy the firmware file to the root directory of the SD card.
    d. Insert the SD card into slot 1 of the SL2-camera.
  4. Switch on the camera.
  5. Open the “Camera Information” menu item in the main menu. Under “Camera Firmware Version” you can see the version of the currently installed firmware and you can install the new firmware under “Start Update”.
  6. Confirm the update process if you want to start.
    a. The camera will guide you through the process of updating your camera.
    b. Please confirm to save your current settings to SD card before proceeding with the update.
    c. The camera starts the update process and informs you when finished.
    d. Restart the camera; do not eject the SD card.
    e. After the welcome video you can select the language.
    f. You now can do some settings via the Leica FOTOS App by connecting the camera with the app. If you have already connected the SL2 to the app, delete it from the app and connect the camera again
  7. The update process is completed successfully.
  8. If you want to load your user profiles go to the menu item “User Profile” in the main menu and then “Manage Profiles”. With “Import Profiles” you can restore your profiles to the camera again.

About The Author

Leica Specialist

David Farkas is a self-admitted Leica junkie and an avid photographer since he was seven years old. He also owns and operates leading Leica dealer Leica Store Miami in beautiful Coral Gables, Florida with his wife Juliana. David has years of experience shooting with just about every Leica camera and lens made within the last few decades.

Related Posts

10 Responses

  1. Greg DeMichillie

    Don’t know if it’s fixed, it earlier today the file downloaded with the wrong name and the SL2 wouldn’t recognize it. The solution was to rename it to “SL2__41_.lfu” (in other words, remove the extra underscore zero at the end) before copying it to the SD card and it works fine.

    • Wook Chang

      Many thanks for the solution.
      I deleted ‘_0’ from the firmware filename, and the firmware installed correctly

    • Mary

      Thank you for posting this. Very helpful even for the SL2S firmware file!

  2. Wook Chang

    Firmware 4.0 had a APO-Summicron bug, and now 4.1 of 120,860 KB, has a bug of 0 byte content, displaying the error message, “no firmware on SD card.”

  3. gabrielpr

    Same here, I had to rename the file to SL2__41_.lfu in order for the camera to start the firmware update. I removed the “_0”.

    • gabrielpr

      I just saw that the Leica fotos app had the notification for the update, I’m wondering if the update works through the app, I’ll try next time…

      • Bernard Schneider

        I just updated the firmware on my Q2 using the FOTOS app., much easier than using an SD card.

  4. David Farkas

    Thanks for the feedback. We’ve updated the firmware file with the extra “_0” in the name to be correctly recognized by the camera. Not sure why Leica provided a file with the wrong name, but we’ve fixed it on the Red Dot Forum FTP server.

    • Mary

      Just FYI, not sure if just me but I had trouble with the SL2-S File. I noticed the file had a dash instead of underscore between the SL2 and S. When I switched to an underscore it worked but wouldn’t work with the original dash. Thanks for posting this info and the comments. Very helpful

  5. Jean-Michel Komarnicki

    Thanks for the download link.
    I wonder if an issue I have with FOTOS is something that has an obvious solution: I cannot get the Bluetooth menu option to go from OFF to ON, no mater what i try. There are no cameras in the FOTOS app until I add the SL2.

    I have no L lenses, so the M-L adapter is mounted. Is that an issue?



Leave a Reply

Your email address will not be published.