O.S not support 433 in RAK2245

Hi everyone I’m new with Lora-wan and i have buy the Rak2245(433) and i burn the full os that provide by the chripstack and when i open it and choose the RAK2245 it show me (932,868 and some other but there is no any option for 433 how can i use the 433 with chripStack)

the link i download the os from it is here and i install the full one with pi(3)
https://artifacts.chirpstack.io/downloads/chirpstack-gateway-os/raspberrypi/raspberrypi3/3.5.1/

IF ANYONE CAN GUIDE ME TO BUILD THE GATEWAY I WILL BE GREAT-FULL