How to Save parameters without FRAM and DATAFLASH

Thanks for reading!
I want to save my parameters in the STM32 flash memory without FRAM and DATAFLASH. My MCU is STM32F427 and the hwdef.dat model I follow is KakuteF7Mini, which is proved can save its parameters after outage when I removed its dataflash W25Q128. But my parameters will turn back to default when I reboot my board.
Here is my (2.1 KB) based on fmuv4 and KakuteF7Mini, and links to the KakuteF7Mini and fmuv4.