Your USB cable is too long or low quality. The exclusive protocol requires a stable voltage. Fix: Use the original Xiaomi USB cable directly into a USB 2.0 port on the motherboard (not a USB hub).
Normally, you enter EDL using a fastboot command ( fastboot oem edl ). However, if the bootloader is locked or the system partition is corrupt, that command fails. Shorting the physically bypasses the boot ROM and forces the processor to wait for a flash command over USB. The "A0101 exclusive" point is the only physical bridge that achieves this on specific Xiaomi boards. mi a0101 test point exclusive
: Bypassing the bootloader to force-install official firmware or developer ROMs. Locating and Using the Test Point Your USB cable is too long or low quality
If successful, it should appear under "Other Devices" or "Universal Serial Bus controllers" as NVIDIA USB Boot-recovery driver Release Short Normally, you enter EDL using a fastboot command