DE10-Standard & DE10-nano both fail at 88% download of EPCS128. - DE10-Standard & DE10-nano both fail at 88% download of EPCS128. Hello, The title is clear, this post is to share experience with the community. I will answer it myself. Best Regards, Johi Replies: Re: DE10-Standard & DE10-nano both fail at 88% download of EPCS128. Hi Johi, So in summary, selecting the incorrect flash devices is the root cause to the programming failure. Also, we can change TCK frequency to 6MHz for more stable programming experience. Thank You. Regards, YL Replies: Re: DE10-Standard & DE10-nano both fail at 88% download of EPCS128. Hello Yl, Yes issues were resolved: for the DE10-nano: it is solved (configure EPCS128->EPCS64) for the DE10-standard all of a sudden, download succeeded. Thank you for asking. Best regards, Johi Replies: Re: DE10-Standard & DE10-nano both fail at 88% download of EPCS128. Hi John, I am confused. So is the issue being solved? Thank You. Regards, YL Replies: Re: DE10-Standard & DE10-nano both fail at 88% download of EPCS128. Correction: DE10-Standard has effectively EPCS128 why but the remark about My nano remains valid: EPCS64 and not EPCS128. Why the download of the DE10-Standard failed at 88 % is still unclear. Best Regards, Johi Replies: Re: DE10-Standard & DE10-nano both fail at 88% download of EPCS128. Hello, As it turns out, after some searching, there is no EPCS128 but EPCS64 installed on the print. The manuals of DE10-NANO & DE10-Standard both refer to EPCS128, replacing EPCS128 with EPCS64 fixes the problem. Best Regards, Johi.