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Which error do you actually see? Wrong device ID in Quartus programmer?
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Oh, yes, the typical error message:
Error (209025): Can't recognize silicon ID for device 1. A device's silicon ID is different from its JTAG ID. Verify that all cables are securely connected, select a different device, or check the power on the target system. Make sure the device pins are connected and configured correctly.
Error (209012): Operation failed
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There would be still the option to write the AS flash by custom logic or external hardware.
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Yes, but i would have spend ages for a custom external programmer only to avoid this "artifical software problem". (Maybe it would be easier to switch to an other FPGA brand. But i assume every manufacturer has it's own problems.) Or is there a easy "external hardware" solution? Indeed, i have my own CAN-Bootloader - but this is so slow and i always need a running Microcontroller and CAn Controller and CAN-Bootloader software. No way for fast development.
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