| Problem | Solution | |---------|----------| | | Try a different USB port (avoid USB 3.0 if unstable). Change USB cable. | | Printer shows but won't print | Set correct paper size: 58mm x 80mm (or 80mm x 80mm) in Printing Preferences . | | Windows re‑installs generic driver | Disable automatic driver updates: System Properties → Hardware → Device Installation Settings → No . | | Serial port printing fails | Match baud rate: TH350 default is 9600,8,N,1 – set same in driver port settings. | | No paper cut command | Use Wep’s OPOS driver or send ESC + i command via software. |