I had to get a player without any internet access or camera awhile back to use while working with confidential information, and ended up getting a 2nd Generation Fiio X3. Was a bit expensive, but was the most recommended for the price at the time, was a lot cheaper than the Sony, B&O and Astell+Kern it was compared with in reviews, and still works well years later. I just use a microSD card reader to update it, there’s a driver to install if you want to use it as a DAC otherwise it’s not needed