XBOX_UEM_SYS_SYSTEM_UPDATE_PASS3 0x3000000CB

What it means

Xbox system error E203 appears on the startup screen during or after a system update that failed in a later stage. The console cannot finish preparing the updated system software.

Applies to: Xbox One, Xbox One S, Xbox One X, Xbox Series X, Xbox Series S

How to fix XBOX_UEM_SYS_SYSTEM_UPDATE_PASS3

1. Do a full power cycle: hold the Xbox button on the console for about 10 seconds until it turns off, unplug the power cable for 2 minutes, then plug it back in and start the console
2. Check that the console has a working internet connection if the error appeared during an online update
3. Open the Xbox Startup Troubleshooter: with the console off, hold the Pair and Eject buttons and press the Xbox button, keeping Pair and Eject held for 10-15 seconds until you hear two power-up tones (on consoles without a disc drive, such as Series S or One S All-Digital, hold only Pair)
4. Run an Offline System Update: on a PC, format a USB flash drive of at least 6 GB as NTFS, download the OSU1 file from Xbox Support, extract it and copy the $SystemUpdate folder to the root of the drive, then select Offline system update in the Startup Troubleshooter
5. From the Startup Troubleshooter choose Reset this Xbox, then Keep games & apps, which reinstalls the system software without deleting installed games
6. If the code returns after these steps, request a repair from Xbox Support (support.xbox.com > Device Support) rather than opening the console, since opening it can void the warranty

Why it happens

A later stage of the system update failed, often because of a corrupted update download, an interruption during installation, or a storage problem.

FAQ

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