I have a Samsung Galaxy Note 4 (N910a), and the WiFi doesn't work. I think it's because it has an old firmware version, so I tried to update it, but when in recovery and trying to update from the SD card, it says "Update from external storage is disabled." the same thing happens with adb.
Unzip the firmware zip file
Click on APP and browse to where you extracted the firmware zip file
Boot the phone to Download mode (Volume down + Power button)
Connect the phone and click Start.
protected by Community♦ Feb 18 '17 at 18:42
Thank you for your interest in this question.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
Would you like to answer one of these unanswered questions instead?