Android ADB device offline Issue on Windows

if you‘re having this same issue the problem is probably an out-of-date SDK. As of Android 4.2.2 there is a security feature that requires you to confirm the RSA fingerprint of the connecting device.  As the following screenshot:

Update ADB TOOL

1. Open the SDK manager and update the tools! Then reboot.

2. OR donwload the ADB from the link:

http://dl.vmall.com/c0b481awh1

http://pan.baidu.com/wap/album/file?uk=2265432600&album_id=153586529128231077&fsid=689995590

Confirm ADB VERSION


Use adb version to check your adb version, and you should work with adb version 1.0.31 and above.

If the version hint is still the old version after adb version command, you‘d better check the adb.exe whether it‘s the old one under the path C:\Windows\System32