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  1. jasgill17's Avatar
    Hi guys

    I'm having an issue with my Samsung Galaxy Note fan edition. I tried downloading an APK file and when I click to install it, a screen pops saying I need to uncheck the "allow install unknown apps". The problem is its disabled and there is no way I can move it to enable. I have attached the pictures. Its really annoying I have tried everything from factory reset to disabling any light app to restarting the phone nothing seems to work! I even tried downloading a new file explorer app as someone mentioned to try that and still no result.

    I came across many users who had this issue and below are some links that are related to my issue but I still cant figure it out. What is strange is if you look at the picture I have attached, there is a whole bunch of other sources which are all disabled such as Chrome, Drive, Facebook, Gmail etc and there is no way I can enable them to download from these sources.

    In the link below, the user said to disable blue light filter as it was interfering with the touch response...I tried this and it doesnt work. But I do believe this could be the issue because I can toggle and click everything else except for the "Enable" push button. I dont remember downloading any screen or light filter hence Im not sure what could be the issue.

    https://forums.androidcentral.com/sa...apps-apks.html

    Would really appreciate it if someone could help because at the moment there is no chance of me downloading any app that isnt available on play store

    Thank you

    Install unknown apps all disabled / greyed out-1.jpeg
    Install unknown apps all disabled / greyed out-2.jpeg
    Install unknown apps all disabled / greyed out-3.jpeg
    08-12-2018 06:34 PM
  2. B. Diddy's Avatar
    Welcome to Android Central! See if there are any other apps causing a screen overlay: https://www.howtogeek.com/271519/how...or-on-android/. Uninstall them one by one to see if it helps.

    Also, check your security settings to see if anything might be blocking this. I'm not sure if Knox plays around with this kind of stuff, but if you have a 3rd party security app installed, check there as well.
    08-12-2018 08:26 PM
  3. jasgill17's Avatar
    Hi Diddy!

    Thanks for the reply. It worked! It was a security settings issue. Steps below is what I did to solve this issue and I have also attached the screenshots

    1. Go to settings
    2. Click "biometrics and security"
    3. Click "other security settings"
    4. Under Device Admin, click "device Admin apps"
    5. Deactivate all device Administrator apps. Now you will be able to enable 3rd party apps installation. Once the installation is completed, activate admin apps again

    Cheers
    Attached Thumbnails Install unknown apps all disabled / greyed out-screenshot_2018-08-14-05-41-35.jpg   Install unknown apps all disabled / greyed out-screenshot_2018-08-14-05-42-10.jpg   Install unknown apps all disabled / greyed out-screenshot_2018-08-14-05-40-33.jpg   Install unknown apps all disabled / greyed out-screenshot_2018-08-14-05-42-44.jpg  
    B. Diddy and belodion like this.
    08-13-2018 04:54 PM
  4. B. Diddy's Avatar
    Great, and thanks for posting such a detailed and well-organized solution!
    08-14-2018 10:49 PM
  5. Shz3885's Avatar
    Mine are not like you i have 4 apps 1:find my device 2:Firmware recovery 3:KC Client and 4:Knox Enrollment Service.Only find my device that i can activate/deactivate but the rest i can't
    02-08-2019 10:57 AM
  6. Leonardo0237's Avatar
    Mine are not like you i have 4 apps 1:find my device 2:Firmware recovery 3:KC Client and 4:Knox Enrollment Service.Only find my device that i can activate/deactivate but the rest i can't
    I'm same problem with u
    Do u find the solution?
    08-12-2019 06:33 AM
  7. Leonardo0237's Avatar
    Someone help me pls
    08-13-2019 05:16 AM
  8. B. Diddy's Avatar
    Welcome to Android Central! It could still be something to do with Screen Overlay. Read the article I linked in post no. 2 above.
    08-13-2019 11:00 PM
  9. mustang7757's Avatar
    Check in phone settings Apps tap it>3 dots upper right corner tap>scroll down to special access then tap install unknown apps and toggle on where you want it to download.
    If that dont work reset app preference Install unknown apps all disabled / greyed out-screenshot_20190814-001122_settings.jpeg
    08-13-2019 11:11 PM

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