We could not update the system reserved partition Now the easiest way to fix this issue is to increase the size of the EFI system reserved partition and that is exactly what we are going to teach in this article. Windows 10 could not be installed We could not update the system reserved partition When a computer starts up, the UEFI firmware loads the OS installed in ESP and other utilities. The EFI System Partition (ESP) is a partition of the hard disk or the SSD drive used by Windows that adheres to the Unified Extensible Firmware Interface (UEFI). The main cause of this error is the lack of available space in the EFI system reserved partition of the hard disk. Fix We could not update the system reserved partition: When you try to update or upgrade your PC to a newer version of Windows you will likely see this error.
