Update README.md

Author: mkalkbrenner

README.md

@@ -517,12 +517,12 @@ working.
 
 This is the default mode for ZeDMD. You don't need to configure anything except setting `enabled` to `true` in
 `DmdDevice.ini` for `[zedmd]` or `[zedmdhd]`.
-BUit in case you have multiple devices or run into issues with the auto-detection and other USB devices attached,
+But in case you have multiple devices or run into issues with the auto-detection and other USB devices attached,
 you can set a concrete COM port to use in `DmdDevice.ini` using `port`.
 
 #### WiFi mode
 
-Alternatively ZeDMD could be flashed with a firmware that provides a WiFi mode.
+Alternatively ZeDMD could be set to WiFi mode in its settings menu.
 In `DmdDevice.ini` there are special devices named `[zedmdwifi]` and `[zedmdhdwifi]` to use it.
 
 To run the ZeDMD in WiFi mode it needs WiFi credentials to establish the connection to your local network.
@@ -632,6 +632,10 @@ upscaled. In the native VNI/PAL/PAC colorizer, you can choose which upscale algo
 
 ## Breaking Changes
 
+### v2.3.1
+
+- ZeDMD firmware versions before 5.0.0 aren't supported anymore.
+
 ### v2.2.2
 
 - In DmdDevice.ini, the `[zedmd]` has been split into `[zedmd]`, `[zedmdhd]`, `[zedmdwifi]`, `[zedmdhdwifi]`.
@@ -890,4 +894,4 @@ Finally, thanks to JetBrains for their awesome tools and support of the Open Sou
 
 ## License
 
-GPLv2, see [LICENSE](LICENSE).
+GPLv2, see [LICENSE](LICENSE).