Welcome in the forum, Joan. We do not see very often Cypress employees asking questions here ;-)
Please try to use a different Miniprog3 and / or a shorter USB cable. Maybe there is a power overload problem.
Thanks for your reply in time. I searched the reference materials yesterday, then I found the forum and posted a post. The forum is just for customer?I'm not familiar with it.I have got some effective suggestions from Indian colleague and I will try. I have tried to use different MiniProg3, it's no effect. About using the shorter USB cable, it can works well with CY8CKIT-042. But the customer's kit board doesn't have the usb interface.
I'm so happy to receive your reply.
Your Miniprog3 is connected with a USB-cable to the board. There have been users here in the forum having problems with longer / bad cables. Changing the cables made the issues disappear.
Here in the CDC (Cypress Developer Community) usually users ask question which are answered by other members or by Cypress employees (when nobody else has got a solution).