AT Flash mandatory ?

[aliyesami]

I bought a WROOM-02u module. Do I have to upload this AT _ Firmware to it ?
if yes then how and where I can download it ? the Espressife site is not letting me download it.

[ESP_Sprite]

If you want the AT functionality, then yes. If your module specifically is an ESP-WROOM-02u, it contains an ESP8266 chip. See here for the firmware you'd need for that.

[aliyesami]

i will be using wifi and GPIO pins , do I need AT functionality ?
I see there are factory firmware also ..(factory_WROOM-32.bin ) do i need to upload this one ?
what about if i am using wroom-32 can it also be used for wifi projects without any firmware?

thanks

[ESP_Sprite]

You need some kind of firmware. If you want to use your ESP in AT mode with another processor, you need to use the AT firmware. If you want to use it standalone, you need some kind of SDK for your ESP8266.