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.

升級/下載需要跳轉的程序需要合并后再使用，即從0地址重新運行。但是使用MRS工具只能顯示當前的工程進行仿真。

可以通過這個方法配置APP代碼（APP的起始地址不為0，需要跳轉）：

藍牙BLE從機Peripheral講解七（CH582OTA升級/空中升級使用說明） - SweetTea_lllpc - 博客園 (cnblogs.com)