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Scala Bulletin Regarding Cumulative Updates for Windows 10 IoT and Potential Startup Failure: April 24, 2018 at 4:00 p.m.


Updated Resolution: June 19, 2018

Issue: Scala has identified a serious problem that can occur when applying recent Microsoft Cumulative Updates for Windows 10 to Scala Media Players. The problem affects Scala Media Player–L and Scala Media Player–S units, running Windows 10 IoT LTSB 2016 (version 1607), the embedded version of Windows 10, with Unified Write Filter (UWF) enabled. If any of the recent Cumulative Updates for Windows are deployed on a Scala Media Player with UWF enabled, the system will encounter a fatal system error and display the code BUGCODE_ID_DRIVER.

Background: As part of the security defense in depth of Scala Media Players, the configuration uses a Windows 10 IoT feature called Unified Write Filter (UWF) to protect against unintended modifications to important files and registry settings, including most of the operating system. Any accidental or malicious changes to these files do not actually modify the on-disk files, and are automatically undone at the next system restart. UWF is enabled or disabled as part of the initial Scala Media Player configuration. Scala does recommend that UWF be enabled as part of system configuration.

To determine whether UWF is enabled on a Scala Media Player, run the script C:\Tools\UWF_GET-CONFIG_C.CMD. If UWF is enabled, Filter state: ON will be displayed in the output.

Resolution: Microsoft has released a fix for the issue in Windows Security Update KB4844880. Scala is currently testing this fix. Until testing is complete, Scala strongly advises Scala Media Player users to avoid applying Cumulative Updates for Windows 10 to their player networks. If a cumulative update is required due to the importance of a given fix or an IT policy, disable UWF first, and leave it disabled until the underlying problem is resolved. 

Scala will continue to update the information in this bulletin as it becomes available. If a user requires immediate assistance with this issue, visit for information about contacting Scala Technical Support.

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