But the driver must manually toggle the GPIO pin that enables the external LNA. In r8712u , that GPIO toggle is commented out as a "TODO." In the aircrack-ng fork, it’s a hardcoded delay loop. The Alfa "3001n" is not a Wi-Fi adapter. It is a test of character. It forces you to understand the Linux USB stack, Realtek’s contempt for GPL compliance, and the fragile art of packet injection.
The RTL8188RU, however, uses and aggregated MSDUs (A-MSDU). When you inject a raw 0x08 (data) frame with a fake source MAC, the 8188RU’s firmware rejects it at the DMA level unless you first disable hardware encryption flags via vendor commands that were never documented. The open source driver has to guess these register offsets. alfa wireless usb adapter 3001n driver
If you just want to crack WPA handshakes, buy the Alfa AWUS036ACH (Realtek RTL8812AU) or the AWUS036H (RTL8187L). But if you want to understand why driver development is the hardest part of wireless security—if you want to feel the pain of reverse engineering vendor binaries—then buy the 3001n. But the driver must manually toggle the GPIO