It appears that some users of the original Shield Tablet may be facing Wi-Fi problems after the version 4.0 update. NVIDIA has acknowledged the issue by stopping the update until the company can resolve it. One of the customer care representatives to the NVIDIA company has updated the NVIDIA forums with some instructions, informing users on the way forward in case they their Wi-Fi can't connect after updating their tablet.
The tablet should rebooted 2 to 3 times. If this doesn't work then try power cycling the tablet between 3 and 4 times, do not reboot but rather turn it off completely. If these methods fail, then charge up the tablet to 100% and try again a number of times.
Back up all the files on your device then perform a factory reset on the tablet.
A number of users report that their Wi-Fi begins working properly again, after powering it off for a couple of hours. Try and leave your tablet switched off for a few hours and then switch it back on again.
The representative went on to say that if the problem persists even after trying out the above methods, then the affected users will have to send him an email of a screenshot displaying the Advance Wi-Fi section page. Go into Settings >> Wi-Fi >> Advanced settings. After taking the screenshot, the image to firstname.lastname@example.org
email address, as well as your type of tablet and state if you have tried any of the potential solutions. In addition, you will also be required to have your username for the GeForce forum included in the email.
NVIDIA is expected to re-release the OS update as soon as the issue has been fixed.
Have you encountered any issues after update? If so, visit NVIDIA forums for the detailed instructions that may help resolve the problem.