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OTAFIX 2.4.1 Preview 2 - reliable DFU completion

Pre-release
Pre-release

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This preview supersedes Preview 1 for testing while preserving the earlier release and tag.

Changes since Preview 1:

  • Persist the CRC validated during application DFU so later boots can verify application integrity.
  • Hardware-reset after a successfully completed BLE application update for clean SoftDevice, radio, and peripheral state.
  • Preserve recovery behavior for interrupted updates and support both single-bank and dual-bank validation paths.
  • Retain USB-first recovery: an active USB data host gets serial/UF2 DFU, with automatic BLE fallback when USB data is unavailable.

Validation completed for heltec_t096 and heltec_t114 in normal and signed-firmware configurations, plus all host delta tests.