The 3RT841B does not support over-the-air updates. You’ll need:

  • Firmware image bundle: application.bin + metadata.json including version, checksum, signature.

    • Example metadata.json "version": "1.2.0", "build": "2026-03-22T00:00:00Z", "checksum": "sha256:abcdef...", "signature": "ecdsa:..."

    Siemens is increasingly moving toward Firmware Over the Air for its smart contactor range. For devices based on the 3RT841B platform, upcoming SIRIUS 3RA24 series feeders will support remote firmware updates via Industrial Edge or CloudConnect.

    What this means for you:

    I’m not sure what you mean by "3rt841b firmware." I’ll assume you want useful content about firmware for a device/model called 3RT841B (for example: firmware overview, update guide, recovery steps, and best practices). Here’s a concise, practical guide you can adapt.