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# Set character size (double height, double width) ser.write(b'\x1D\x21\x11') # 0x11 = both width & height doubled ser.write(b'IJPS58H TEST\n')

Before downloading from random “driver download” websites, always scan the file with VirusTotal. Better yet, use open-source ESC/POS drivers from GitHub or trusted POS forums.

Even with the correct driver, issues can arise from improper settings. For example, messy or "garbled" text often indicates a mismatch between the PC's baud rate and the printer's internal settings. Additionally, if the printer produces blank pages despite a successful driver installation, it may indicate hardware-level issues like damaged font chips or incorrectly loaded thermal paper. Find Pos58 Thermal Printer Driver Download From Xprinter

Windows replaces the driver with a generic one after an update. Fix: Reinstall the driver, then disable automatic driver updates: