diff --git a/Sonoff-RF-Bridge-433.md b/Sonoff-RF-Bridge-433.md
index 1252a139..3218e0b4 100644
--- a/Sonoff-RF-Bridge-433.md
+++ b/Sonoff-RF-Bridge-433.md
@@ -34,7 +34,7 @@ See [Supported Commands](https://github.com/arendst/Sonoff-Tasmota/wiki/Commands
 
 <img src="https://github.com/arendst/arendst.github.io/blob/master/media/sonoff_bridge_rffw_upgrade.png" width="300" align="right" />
 
-By updating the firmware of the Rf chip a EFM8BB1 MCU new possibilities become available. Starting with Tasmota v6.0.0a the Rf chip firmware upgrade is easily done using Web Gui **Upgrade by File Upload**. Tasmota supports the Original and Portisch firmware. **For downloading the firmware press the green download button** on the main page. If you download the firmware via click on file it will be corrupted (error "Magic byte is not 0xE9").
+By updating the firmware of the Rf chip a EFM8BB1 MCU new possibilities become available. Starting with Tasmota v6.0.0a the Rf chip firmware upgrade is easily done using Web Gui **Upgrade by File Upload**. Tasmota supports the Original and [Portisch firmware](https://github.com/Portisch/RF-Bridge-EFM8BB1). **For downloading the firmware press the green download button** on the main page. If you download the firmware via click on file it will be corrupted (error "Magic byte is not 0xE9").
 
 ## Flash-Process of Hardware R2 with Hardware preparation 
 _This chapter applies only for R2 and only if you want to use USB for powering the device during EFM flash process._