Back in December, NVIDIA had started rolling out Marshmallow update for the Tablet K1, but was later halted after reports of it causing WiFi issues for some users.
Now, the company has resumed Marshmallow updates for both the Shield Tablet and Tablet K1. In an official blog post, a NVIDIA spokesperson said that they were confident that the new update resolves previous issues with WiFi.
You should see an update notification on your device, if not then just head over to Settings -> About tablet and check for updated there.
Source: NVIDIA
