Frequently, you just need to hold the Volume Down (or both Volume buttons) while plugging in the cable.
Extract the contents; if prompted for a password, it is typically LenovoUone setup tool while the USB is still disconnected. lenovo u1 tool
The Lenovo U1 Tool is a third-party, PC-based software utility designed to communicate with Lenovo devices at a deep, low-level (bootloader) layer. Unlike official tools such as Lenovo Smart Assistant (LMSA) or QPST, the U1 Tool specializes in bypassing security barriers, flashing unofficial firmware, and resurrecting "bricked" devices that no longer respond to standard recovery methods. Frequently, you just need to hold the Volume
The official documentation goes on to provide the instructions for creating the tool: if prompted for a password
The Lenovo U1 Tool!