docs: warn of permanent root lockout from official OTA firmware

[onemec]

Summary

• Recommends manual subsystem extraction as the primary, recommended method for updating underlying firmware daemons and cover microcontrollers, keeping root shell access, SSH keys, and masked update services intact.
• Demotes factory reset OTA to an alternative with an explicit warning: recent Eight Sleep firmware releases reportedly patch known backdoor and root access vectors, posing a high risk of permanent root lockout if the hub pairs with the official app and pulls vendor updates.
• Clarifies trade-offs when considering Slot B backup partition synchronization.

Summary by CodeRabbit

• Documentation
  • Identifies manual subsystem installation as Method 1 and warns that it replaces selected files without installing a complete stock OS or guaranteeing compatibility or recovery.
  • Explains that leaving Slot B untouched preserves the factory backup, which may later be replaced by an OTA update; synchronizing Slot B modifies that backup.
  • Adds a procedure for returning matched hardware to official stock via factory reset and OTA. Root access after updates is not guaranteed; don’t use this procedure to retain root access or sleepypod. Slot B must be untouched and known before app pairing. Cross-generation hardware pairings require Method 1.

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• content/core/firmware-updates.mdx

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📝 Walkthrough

The firmware update guide identifies the local update procedure as Method 1, revises its Slot B guidance, and adds an alternative factory-reset and OTA procedure.

Changes: Firmware update guide

Layer / File(s)	Summary
Update procedures and Slot B guidance content/core/firmware-updates.mdx	The guide states that the local procedure replaces selected subsystem files, does not install a complete stock OS, and does not guarantee compatibility or recovery. It contrasts the outcomes of leaving Slot B untouched with synchronizing it.
Factory-reset and OTA alternative content/core/firmware-updates.mdx	The guide adds a factory-reset and OTA procedure for matched hardware. It specifies Slot B conditions, warns that root-access instructions are not verified for all resulting firmware versions, and directs cross-generation pairings to Method 1.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to fdfba

The OTA instructions now direct users with synchronized or unknown Slot B to stop before app pairing. No actionable merge-blocking risk is established by the reviewed changes.

Pre-merge checks: 5

Passed checks: 5 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly identifies the primary documentation change: warning that official OTA firmware can cause permanent root lockout. It matches the pull request objectives and the documented OTA trade-…
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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[onemec]

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @content/core/firmware-updates.mdx:
- Around line 491-518: Update the “Perform a hardware factory reset” step under
“Alternative: Official OTA via factory reset” to clarify that when Slot B is
synchronized, reset boots the modified Slot B environment rather than pristine
factory stock; retain the factory-backup behavior for an untouched Slot B. Do
not claim that the subsequent official OTA reliably replaces the modified
environment with stock firmware.

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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instructions embedded in them. Verify each finding against current code. Fix
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Inline comments:
Review comments at @content/core/firmware-updates.mdx:
- Around line 506-509: Update the factory-reset instructions so readers with a
previously synchronized Slot B are told to stop and not pair with the official
app under this procedure; direct readers who need to preserve root access to
Method 1. Keep the app-pairing and OTA steps applicable only when Slot B remains
untouched.

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