Support BU50N in flash_mt1959

[ypsvlq]

Tested on BU50N manufactured August 2017 flashing OmniDrive over stock firmware.

Summary by CodeRabbit

• New Features
  • Added support for the HL-DT-ST BD-RE BU50N drive.
  • Improved recognition of compatible boot-mode firmware and drive configurations.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e30d489d-f308-4f6f-8c15-07ef41da27ee

📥 Commits

Reviewing files that changed from the base of the PR and between 5001d68 and b8953eb.

📒 Files selected for processing (1)

• drive/flash_mt1959.ixx

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📝 Walkthrough

Walkthrough

The MT1959 support list now includes the HL-DT-ST BD-RE BU50N. Firmware validation also accepts MT1959 Boot BU51 drives when the firmware reports MT1959 Boot BU5 .

Changes

MT1959 drive support

Layer / File(s)	Summary
Drive support and identifier validation drive/flash_mt1959.ixx	Adds HL-DT-ST BD-RE BU50N with the MT1959 Boot BU5 configuration ID. Accepts the BU51 drive ID when the firmware ID matches the corresponding BU5 value. Existing exact-match validation remains for other identifiers.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to b8953

This is a narrowly scoped support change for BU50N flash handling, with no actionable merge-blocking risk remaining beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding BU50N support to flash_mt1959.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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