Porting AT472-BU-98000-r0p1-00rel0 to Avnet 7a50t development board failed

Following AT472-BU-98000-r0p1-00rel0/docs/arm_cortex_m1_designstart_fpga_xilinx_edition_ug_100211_0001_00_en.pdf, a vivado2018.2 project was established on Avnet 7a50t kit. I also built a simple hello word project in keil 5.24.1, see the attachment. Then I copy the bram_a7.hex, bram_a7.elf files to the vivado work directory, update or recompile the vivado project. Download to the development board , does not work.7a50t_m1_20210119.zip