If your Redmi 9A still isn't showing up, try these quick fixes:
The Redmi 9A is powered by a MediaTek Helio G25 processor. Unlike Qualcomm devices, MediaTek chips require specific drivers for deep-level flashing. If you plan to use SP Flash Tool to unbrick your device or flash a stock ROM, the standard Xiaomi driver will not work. You will need the MediaTek USB VCOM driver. driver redmi 9a
Performing advanced system tweaks or unlocking the bootloader. If your Redmi 9A still isn't showing up,
Use the original Xiaomi cable if possible. Many third-party cables only support charging, not data transfer. driver redmi 9a
Near the drop-off point, a signal jammer killed his GPS. Most drivers would be stranded, their smart-glasses going dark. Kael simply flicked on the Redmi’s built-in