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: The POS application cannot claim the printer because another process has a handle open. Fix : Go to C:\OPOS\Bin and run CheckHealth.exe (if included). Otherwise, reboot the terminal. The V8.11 driver has a known quirk where the print spooler holds a lock after a crash.
Because many POS printers are sold as "white label" products (generic hardware sold under many brand names), installing the V8.11.230513 driver often requires a manual approach. POS Printer Driver V8.11.230513.exe