The most common POS failure is the cash drawer failing to open. Driver V8.11 has a refined timed pulse mechanism. Unlike newer drivers that sometimes disable the drawer pin for energy savings (or older drivers that fire twice), V8.11 sends a consistent, singular 200ms pulse—exactly what most hardware expects.
If you are currently facing "Printer offline" errors or garbled receipts, rolling back to V8.11 usually fixes it. pos printer driver v8 11