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Apple Releases Firmware 1.4.90 for 140W USB-C Power Adapter
Apple released firmware version 1.4.90 for its 140W USB-C Power Adapter on September 8, 2026. The update installs automatically when the adapter is connected to a Mac or another device and cannot be applied manually.
DNA Brief
Signal Summary
Apple has not published release notes for the update, so the contents of firmware version 1.4.90 remain unclear. Users do not have to start a manual update process; the adapter updates automatically over time while connected to a Mac or another device.
Why It Matters
Because Apple has not disclosed what changed and provides no manual installation option, 140W USB-C Power Adapter users cannot verify in advance which fixes or changes firmware 1.4.90 contains. The update is handled automatically when the adapter is connected to another device.
Evidence
Start with the primary evidence, then review supporting sources and context.
Primary Evidence
1Apple Releases Firmware Update for 140W USB-C Power Adapter
Joe Rossignol
“Apple today released a firmware update (version 1.4.90) for its 140W USB-C Power Adapter. It is unclear what is included in the latest firmware, as Apple does not publish release notes for this. The update will be installed automatically over time when the power adapter is plugged in and connected to a Mac or other device.…”
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