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The Switch 9.1.0 system update was released on December 4, 2019. This Switch update was released for the following regions: ALL.

Security flaws fixed: yes.


Official ALL change-log:

  • General system stability improvements to enhance the user's experience, including a solution for the following:
  • Resolved an issue where the color animation was not displaying correctly when attaching a Joy-Con controller to the Nintendo Switch console.

See the official China changelog for the China-specific changelog.


All files in RomFS were updated.

Secure Monitor

Secure Monitor was updated.

  • System register configuration now sets CPUACTLR_EL1.
    • This sets CPUACTLR_EL1 to the same value as in KernelLdr, previously this code only configured CPUECTLR_EL1.


  • The firmware revision magic was changed from 0x16B to 0x18C.

<check back for more diffs later>

FIRM Sysmodules

FIRM sysmodules were updated. Specific diffs available below:


The only difference is that nn::crypto::VerifyRsa2048PssSha256 now memsets the decrypted signature buffer to zero after extracting the hash.


The only difference besides GNU build hash update is that the Anti-Downgrade arrays were updated to the new title versions.

System Titles

The following was updated:

See Services_API for the new lp2p:m service.

NPDM changes:

  • migration: Now has access to srepo:u.
  • The following now have access to the new lp2p:m service: qlaunch, LibraryAppletCabinet, LibraryAppletController, LibraryAppletNetConnect, LibraryAppletPlayerSelect, LibraryAppletMiiEdit, all web-applets except for LibraryAppletOfflineWeb, OverlayApplet, and LibraryAppletMyPage.

See Also

System update report(s):

Nintendo Switch System Versions