Look at the physical sticker on the back or bottom of your printer device. Confirm whether it is an official OKI product (such as an OKI POS terminal printer) or if it uses a generic thermal printer print-engine (like a partner brand PT330 series). 2. Visit the Official OKI Support Portal
Given Oki’s divestiture of printer assets, the most reliable source is or PosGuys.com legacy drivers . Search: Oki Pt 330 Driver Downloadtrmds 5