So far, I have hooked up a MEGA and have it working great. Then I bought these:

https://www.amazon.com/gp/product/B07QCP2451/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

I am unable to install any firmware due to "Failed to connect to ESP32: Timed out waiting for packet header". I have tried each of the two ESP32 units and neither work. They're hooked up to my computer via USB and I'm trying to install over serial. 
Are these not what I think they are? Or any thoughts on why they are not communicating/receiving firmware? 

Additional details (I'm new to this, I don't know what is relevant): I was able to add a driver, and the driver is "Silicon Labs CP210x USB to UART Bridge"

Thanks!