I have 2 DE0-Nano Development and Education Boards. The old board worked fine with the program, but the new board does not work with the same program. The EPCS chip of the new board is smaller than the old one, and I have an error using EPCS.

Hello Welcome to INTEL forum. The DE0-Nano Development and Education Boards belong to Terasic. It would be better if you could contact Terasic for enquiry related to Terasic board. https://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&CategoryNo=12&No=20 Please accept my apologies for not being able to assist you fully as this is out of my expertise.