Before diving into software, verify how Windows sees your device: Open Device Manager: Right-click the Start button and select Device Manager Watch for Changes:

Select , click Have Disk , and browse to your downloaded MTK driver folder. Select the MTK USB Port or MediaTek USB VCOM Port . Verify Physical Connection

A corrupted preloader partition cannot execute a handshake instruction. If you recently flashed an incorrect firmware file, you must first flash a verified, factory stock preloader.bin file using SP Flash Tool's "Download Only" mode. Address Hardware Faults

The phrase "modem handshake" refers to the initial synchronization between the PC tool and the device’s baseband processor. The handshake involves:

, you need drivers.