Try a different USB port. Switch from USB 3.0 (blue) to USB 2.0 (black). Also, ensure your Galaxy A12 is not in "Charge only" mode.
Using tools like Samsung Odin to flash stock ROMs or official system updates. SAMSUNG Galaxy a12 Exynos 850 Drivers Download
The Exynos 850 is an octa-core chip (8x Cortex-A55). It requires specific USB and ADB interface drivers to communicate with Windows operating systems. Try a different USB port
The Exynos 850 chipset is a mid-range processor that provides a smooth performance. It comes with an octa-core CPU, Mali-G52 MP1 GPU, and 3GB/4GB/6GB RAM options. The device handles everyday tasks like browsing, social media, and streaming with ease. However, it may struggle with demanding games and multitasking. Mali-G52 MP1 GPU