Where does ReButton store our SSID , PASS

I have a Rebutton.
At the first time, Rebutton wakes up as a wi-fi station mode.
At that time, User enter the SSID and PASS.
Where does information store ?
NOR Flash of QSPI?
EEPROM of MCU Flash memory ?

Thank you.

Hi @1115 ,
ReButton store SSID and PASS to STM32 internal Flash.

Thanks for replying.