How to change size of rootfs & userapp space


I want to change the size of rootfs so that I can run my Qt5 application.For that I have see this
thread but those AT!ENTERCND=“A710” not working, Do I need to enable any interface for At commands?


please help me with the bellow issue

I run the following cmd with following settings

Now my AT!APPPARTCHG given me
the last pad is changed.

Again I am trying to set default But cmd giving Error.