In some situations, the Speedlite EL-100 might not fire correctly. Firmware version 1.0.1 fixes this. Details of how to update the Speedlite firmware and the firmware download link are available at: Speedlite EL-100 firmware Note that only selected EOS camera models released in 2014 or later can be used for the firmware update. Models released since then but which cannot be used are: - EOS 100D / Rebel SL2 - EOS 700D / Rebel T5i - EOS 1200D / Rebel T5 - EOS 1300D / Rebel T6 - EOS 2000D / Rebel T7 - EOS 4000D / Rebel T100 - EOS M3 - EOS M5 - EOS M6 - EOS M10 - EOS M100 Full details of the update procedure are supplied as a PDF with the download, which is available for Windows and Mac computer systems.
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