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How is this different from the HC22002? Same flashing function, plus a galvanic isolation barrier between your PC and the target — for mains-referenced, independently powered, or different-ground targets.
Can I power the target from the programmer? Yes, over the isolated VCC line for small modules. For independently powered targets, leave VCC disconnected and keep grounds separate.
Flashing fails or times out. Check TX↔RX crossed, GND connected, target powered. Lower the baud rate and retry.
Do I lose isolation if I connect both supplies? Yes — don’t bridge the target ground to PC/USB ground.
More help: support@hardcode.com.br