Microsoft has resumed the rollout of security updates for AMD devices. The updates patch the Meltdown and Spectre vulnerabilities.

Microsoft released these patches on January 3, but the company stopped the rollout for AMD-based computers on January 9 after users reported crashes that plunged PCs into unbootable states.

After working on smoothing out the problems with AMD, Microsoft announced today it would resume the rollout of five (out of nine) security updates. The five updates are:

January 3, 2018—KB4056892 (OS Build 16299.192) (Windows 10 version 1709)

January 3, 2018—KB4056898 (Security-only update) (Windows 8.1, Windows Server 2012 R2 Standard)

January 9, 2018—KB4056895 (Monthly Rollup) (Windows 8.1, Windows Server 2012 R2 Standard)

January 3, 2018—KB4056897 (Security-only update) (Windows 7 Service Pack 1, Windows Server 2008 R2 Service Pack 1)

January 9, 2018—KB4056894 (Monthly Rollup) (Windows 7 Service Pack 1, Windows Server 2008 R2 Service Pack 1)

The four security updates that are still paused are:

January 3, 2018—KB4056888 (OS Build 10586.1356) (Windows 10 Version 1511)

January 3, 2018—KB4056891 (OS Build 15063.850) (Windows 10 Version 1703)

January 3, 2018—KB4056890 (OS Build 14393.2007) (Windows 10 Version 1607, Windows Server 2016, Windows 10 Mobile, released in August 2016)

January 3, 2018—KB4056893 (OS Build 10240.17735) (Windows 10 Enterprise released in July 2015)

The Meltdown flaw does not affect AMD devices, but these updates include an OS-level patch for the Spectre flaw. An additional CPU microcode (firmware) update is also needed to fully patch the Spectre bug. AMD said it was working on firmware updates it hoped to have ready by the end of the current month.