You have the wrong driver. Uninstall it. Then install the "ESC/POS" driver, not a "Zebra" or "EPOS" driver. The JK5801H speaks ESC/POS language.
This method is 100% free and requires no paid software. thermal printer jk5801h driver free
The JK5801H is often a rebranded version of a generic Chinese thermal printer. It typically uses the for “POS58” or “Generic/Text Only.” You have the wrong driver
Hardware hackers often reverse-engineer these printers. Websites like host free, signed drivers for many thermal printers. Search for “libusb thermal printer driver” or “JK5801H linux driver.” These are absolutely free and often more reliable than sketchy driver download sites. thermal printer jk5801h driver free