The (by UnlockTool or other developers) is used to bypass SP Flash Tool authentication , SLA (Secure Lock Authority) , and DAA (Download Agent Authentication) on MediaTek devices. It allows:
When a handshaking error occurs, users typically see: mtk bypass tool handshaking error
= Failure to establish a valid, synchronized communication channel between the PC-side tool and the target device’s low-level boot software. The (by UnlockTool or other developers) is used
If the handshake fails once, the device may be stuck in a "hanging" state. Disconnect the battery (if possible) or hold the Power button for 10–15 seconds to fully reset before trying again. SLA (Secure Lock Authority)