Remote System update issue in Cyclone IV E device

We need to implement remote system update feature on cyclone IV FPGA. We are using Quartus Prime Standard Edition 18.1. We are facing issues in reconfiguring the application through NIOS S/W.

We have one reference example design for Cyclone V which is available on Intel documentation resources and we have executed it on Cyclone V development board and we are able to implement this feature successfully on it.

Our custom design is on Cyclone IV where we are able to write the application h/w images and s/w image from factory configuration but we are not able to jump to application configuration from factory configuration without using watchdog timer.

That means when we are using watchdog timer by setting watchdog time value then only we are able to jump to application configuration from factory configuration otherwise it is not working, it is issue with cyclone IV but for Cyclone V it is not having this issue.

We are following the Remote upgrade user guide and cyclone iv device handbook to implement remote upgrade feature on cyclone iv (custom design). For your reference the pdfs are attached herewith.

Please help us to be able to come out from this issue so that without using watchdog timer we can load application images to FPGA and remain there unless there is some trigger from user side.