Hi,
Are you using a Development kit?
- Check which configuration scheme is used on your board.
- Refer below user-guide for programming steps session 4.1.
https://www.terasic.com.tw/cgi-bin/page/archive_download.pl?Language=English&No=502&FID=cd9c7c1feaa2467c58c9aa4cc02131af
To get source files from flash, You have you use the flash loader to establish a bridge between flash and cable. Refer below link
https://www.intel.com/content/www/us/en/programmable/documentation/mwh1410805299012.html
After loading flash loader (sof) in FPGA auto-detect and use the Examine feature in the Quartus® II Programmer to read back the .pof. You can then save this file and use it to program other EPCS devices
Regards
Anand
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