The USB remote will only take a picture when you exit <ALT> and are back in normal Canon shooting mode.
But, when I set the settings to "OnePush", "Normal", nothing happens.
Could you post the 100a firmware? I think that it is not part of firmware dump repository.
Added theSX530 1.00Afull 16MB dump by gvandyk from this forum post to the CHDK P&S FW dumps repository.
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