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Cyclone IV supports FPP mode, but if you compress the configuration data, Configuration will not succeed. Could I ask the reason?

Cyclone IV supports FPP mode configuration, but does not support FPP configuration in compressed mode.

Please refer to Device handbook, page 2 Table 8-1 at the following URL link.
  https://www.altera.com/en_US/pdfs/literature/hb/cyclone-iv/cyiv-51008.pdf

Therefore, when using FPP mode, generate configuration data in uncompressed mode.

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