problems about EPCS devices' storage format

I didn't previously answer your post, because I didn't understand what actually meant with storage format respectively file format. Unfortunately, it's still unclear after all.

Yes, Altera EPCS is compatible with industry standard SPI flash. This is also obvious from the Altera data sheets. Respective types with same ID have been used as a replacement by other users, as reported in the forum before.

For configuration purposes, the binary bitstream, as contained in the *.rbf file must be programmed to the SPI flash. But the bit order is LSB first, as specified in the AS configuration scheme documents. If I remember right, I have mentioned this fact also in response to one of your previous same topic posts.

So, which problem is actually left?