3rt841b Firmware Upd Patched | SIMPLE | 2024 |

: Continue holding the button until the standby LED begins to flash rapidly or an "Upgrading" progress bar appears on the screen.

You may have seen references to “3RT841B firmware” in Siemens documentation or forums. That usually refers to that communicates with the 3RT841B, such as: 3rt841b firmware upd

If your system requires updated support for the 3RT841B (e.g., new I/O mapping or diagnostics): : Continue holding the button until the standby