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As of right now CHDK does not appear to support the a520, there is a chance that support is to come as the a540 wasn't supported until the last year or so and the software is constantly being updated. The main problem is that the a520 uses the DIGIC I processor and CHDK is designed for DIGIC II or III, but as I said there are constantly people working on the program so it will likely just be a matter of time before the older processor is supported.

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