Without the correct driver, Odin will not detect your phone (no blue/added box).

Essential but Tricky – Works Great Once Properly Installed

Reboot your PC to ensure the system initializes the new drivers correctly.

The is a critical software component that allows your Windows computer to communicate effectively with the Samsung Galaxy A12 (SM-A127F) , also known as the Galaxy A12 Nacho . Whether you are a general user looking to transfer photos or a power user attempting to flash official firmware, having the correct drivers installed is the first step toward a stable connection. Why You Need the Samsung A127F USB Driver

Here’s a well-structured, helpful review of the (for the Galaxy A12 / A127F model). You can use this as a blog post, forum answer, or product-style review.