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Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

update manifest

A signed description of a release: version, chip, size, hash and where to get it.

An update manifest is a signed metadata document describing a release -- version, target chip and hardware revision, image size, SHA-256 and URL -- which the device checks before downloading or installing.

Examples

  • The lab's manifest for 1.5.0 names chip esp32s3, min_hw_rev 1, the image size, its SHA-256 and the download url, with a signature over its exact bytes.

  • The device checks the manifest's signature before parsing it, then the chip, hardware revision, size and version, and only then downloads.

See also

firmware image downgrade attack digital signature hash function
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