How can I specify the address for the downloaded firmware in mounriver? The download configurator always specifies a zero address without any possibility of changing it...The linker file cannot be modified in my situation. Thanks!

And is it possible to flash DataFlash via mouniver?

Maybe you can try OpenOCD if it supports CH58x series.

I can use openOCD but I would like to know if it is possible to do the same through the IDE because it will be much more convenient

It seems not support at this moment.

升级/下载需要跳转的程序需要合并后再使用，即从0地址重新运行。但是使用MRS工具只能显示当前的工程进行仿真。

可以通过这个方法配置APP代码（APP的起始地址不为0，需要跳转）：

蓝牙BLE从机Peripheral讲解七（CH582OTA升级/空中升级使用说明） - SweetTea_lllpc - 博客园 (cnblogs.com)