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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

trial boot

A new image's first run, on probation until it marks itself valid.

A trial boot runs a newly installed image in the pending-verify state; if the device restarts before the image marks itself valid, the bootloader rolls back to the previous image.

Examples

  • After the switch, 1.5.0 starts in ota_1 as PENDING_VERIFY; if it resets before marking itself valid, the bootloader marks it ABORTED and boots 1.4.0.

  • A new image that crashes during its trial boot rolls back by itself, with no code of its own needed.

See also

health gate rollback otadata
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