button on the TV (not the remote) while plugging the power cord back in.

The 2021 firmware update was particularly significant for these boards, improving stability and signal processing for various inputs. Key Specifications of the 3RT841B Board

: Utilize Siemens' support tools, such as their Support Request system, where you can submit a query about the firmware.

You will need a free MySupport account. Also download the accompanying release notes (PDF) – they contain critical upgrade sequence details for multi-device systems.

Some stored parameters from pre-2021 firmware used different data types (e.g., UINT vs DINT for current limits). Fix: Re-enter the parameters manually in TIA Portal and download again. Do not restore an old backup from a different firmware major version.