Lenovo Yoga 9i 2-in-1 Gen 9 operating-system update will not install

The checks in more detail

Start with the simple things: restart the laptop, connect it to its charger, since a laptop on battery may refuse a firmware update, and check that there is at least twenty gigabytes free on the main drive. A BIOS update in particular will not start if the battery is low or if the charger is not connected. For Windows Update, run the Windows Update troubleshooter from Settings, System, Troubleshoot, Other troubleshooters. If an update keeps failing with the same code, search the code on Microsoft's support site.

A stuck update can sometimes be cleared by pausing updates, restarting, and then resuming. Disconnect external drives and docks before updating, since they sometimes disturb a driver. For Lenovo updates, open Vantage and look at System Update, install the critical updates first and restart between groups; a long chain of driver updates installed at once is more likely to fail than one at a time. The Yoga 9i uses a Lenovo Intel Core Ultra processor, with its own set of firmware, chipset and graphics drivers, and these should be installed in an order that Lenovo's tool decides.

If a driver update caused the problem, roll it back in Device Manager through the device's Driver tab. Do not turn the laptop off during a BIOS update, which takes several minutes and restarts the machine a few times. If a BIOS update fails and the laptop does not start, Lenovo provides a recovery method on the support page for the model. Contact Lenovo with the serial number if updates keep failing, and back up your files first.