Most tools give up when your device is bricked. U1 doesn’t. It forces the device into Download Mode even when ADB is blind and fastboot is mute. One click, and you’re back to flashing a stock ROM.
Disable Secure Boot in the BIOS settings, insert the USB, and boot from it. Execute Updates: lenovo u1 tool best
What it is and who it’s for
It is primarily intended for field technicians. While versions can be found on community platforms like GitHub , users are advised to proceed at their own risk. Most tools give up when your device is bricked
ASparkOfFire/lenovo-u1-tool: Lenovo Uone Tool for ... - GitHub insert the USB