This article from the www.buytwowayradios.com blog will help you. Excerpts and a link to the full article are below.
With the recent uncertainty surrounding the FCC and import radios, TYT has made a decision to ship all of their radios locked down to the 150-160 MHz VHF and 450-460 MHz UHF ranges.
They actually made these changes a few months ago, and at first “unlocking” the radios to allow use outside of these limited ranges required special unlock software. With the most recent firmware release, however, TYT has made the unlock process much more simple. All of their models can now be unlocked by holding down a key combination while powering on the radios. In this article, we’ll show how to unlock the TYT MD-9600 mobile radio, and the MD-380, MD-390, MD-UV380 and MD-2017 handheld radios.
Continue reading at the following link. https://www.buytwowayradios.com/blog/2019/03/how-to-unlock-tyt-dmr-radios.html