cyclone III: after update dead

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After a power off and on the system does not start anymore. To get the system running again I have to flash via JTAG.

Any idea?

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Did you test if the fpga completes configuration? Maybe fpga configures correctly but then it can't bootload the Nios processor.

This would be a common problem and is usually related to a wrong bootloader file or misplacement of Nios code in epcs image.

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Is there a way to read the epcs flash in the case, when the system does not start anymore.

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Configure with jtag (without flashing it) any design capable of reading epcs.

Then you can download data and compare with your remote update image.