For devices that run Tasmota and Portisch firmware to convert the received B1 code into B0. Tested with Tasmota 14.4.1 and Portisch 0.4.9 with a Sonoff RF Bridge R2 V2.2, Yooda 433MHz remote controls for shutters and B1 codes found on different websites.
There exists an online tool for it you can use: https://bbconv.hrbl.pl/
The website is down from time to time and the provided Python file in the Portisch Wiki doesn't seemed to work and has a lot of functionality besides code conversion.
This 'new' written python code includes a simple GUI and a standalone version for Linux, Windows 10 & 11 can be found in the installer folder. Thus no internet connection, or other service is required.
Information for B1 and B0 code can be found in the Portisch Wiki, but for the conversion I mainly looked at available B1/0 codes that I received from my devices and online converter. Comments on my thought process can be found in the python file. It is tested on a very limited sample size. When you find that the online tool can convert a code this can't, please let me know.
Copy the Tasmota console output from the Portisch command 'rfraw 177' into the input text box and hit convert button on the bottom left.


- https://github.com/Portisch/RF-Bridge-EFM8BB1/wiki/
- https://github.com/Portisch/Sonoff-Tasmota
- https://tasmota.github.io/docs/
I found alternatives when I was done, still want to share them for anyone interested.
- https://bbconv.hrbl.pl/ (already mentioned above)
- https://github.com/holgerschillack/b1-to-b0-code-converter (coded in Vue, includes a deployed version Link)
- https://github.com/francoismassart/0xB1-to-0xB0 (coded in JavaScript)