updates README

README.md

@@ -9,7 +9,7 @@ This is a little pet project to install TLS certificates into your [FRITZ!Box](h
 
 Although it should work with other versions as well, it is only tested with:
 
-* FRITZ!Box Fon WLAN 7530 (FRITZ!OS: 07.29)
+* FRITZ!Box Fon WLAN 7530 (FRITZ!OS: 07.50)
 * FRITZ!Box 7490 (FRITZ!OS: 07.29)
 
 In case you want to know how to do that manually, take a look at AVM's [knowledge base article](https://en.avm.de/service/fritzbox/fritzbox-7390/knowledge-base/publication/show/1525_Importing-your-own-certificate-to-the-FRITZ-Box/).