diff --git a/README-Tetra b/README-Tetra
new file mode 100644
index 00000000..8d1a344f
--- /dev/null
+++ b/README-Tetra
@@ -0,0 +1,37 @@
+*
+* Adi Bier / DL1HRC
+* dl1hrc { at } gmx . de
+*
+
+This branch only works if you have the following things:
+
+- Motorola MTM5x00, MTM800E, MTM800FuG
+- active data cable, e.g. PMKN4104
+- (Sepura/Cleartone my work, but no warranty)
+
+The MS is completely controlled by AT-commands over the PEI interface
+
+Installation instructions from Frédéric/F1IWQ can be found here:
+https://github.com/f1iwq2/Tetra_Link_boardIWQ/blob/main/Doc/Download%20svxlink-tetra.pdf
+
+Here are two quick-and-dirty installation/update documentation, keep 
+in mind: No configuration will be done!
+
+1) first time installation (including German(!) voice announcements):
+
+You may use my semi-automatic installation-script from here 
+http://svxlink.ham-radio-op.net/svxlink/svxlink-tetra-contrib.sh
+
+Start installation as root:
+wget -O - http://svxlink.ham-radio-op.net/svxlink/svxlink-tetra-contrib.sh | bash
+
+
+2) Update an existing tetra-contrib installation made by the previous script 
+as root:
+
+systemctl stop svxlink
+cd /home/svxlink/svxlink/src/build/
+git pull
+make install
+systemctl start svxlink
+
diff --git a/src/svxlink/reflector/Reflector.cpp b/src/svxlink/reflector/Reflector.cpp
index c0671623..5316bd34 100644
--- a/src/svxlink/reflector/Reflector.cpp
+++ b/src/svxlink/reflector/Reflector.cpp
@@ -966,8 +966,11 @@ void Reflector::writeUserData(std::map<std::string, User> userdata)
 
 string Reflector::jsonToString(Json::Value eventmessage)
 {
-  Json::FastWriter jsontoString;
-  std::string message = jsontoString.write(eventmessage);
+  Json::StreamWriterBuilder builder;
+  std::unique_ptr<Json::StreamWriter> writer(builder.newStreamWriter());
+  std::ostringstream ostream;
+  writer->write(eventmessage, &ostream);
+  std::string message = ostream.str();
   message.erase(std::remove_if(message.begin(), message.end(), 
                 [](unsigned char x){return std::iscntrl(x);}));
   return message;
diff --git a/src/svxlink/svxlink/ReflectorLogic.cpp b/src/svxlink/svxlink/ReflectorLogic.cpp
index 66df5059..49b05e94 100644
--- a/src/svxlink/svxlink/ReflectorLogic.cpp
+++ b/src/svxlink/svxlink/ReflectorLogic.cpp
@@ -1867,8 +1867,11 @@ void ReflectorLogic::handlePlayDtmf(const std::string& digit, int amp,
 
 string ReflectorLogic::jsonToString(Json::Value eventmessage)
 {
-  Json::FastWriter jsontoString;
-  std::string message = jsontoString.write(eventmessage);
+  Json::StreamWriterBuilder builder;
+  std::unique_ptr<Json::StreamWriter> writer(builder.newStreamWriter());
+  std::ostringstream ostream;
+  writer->write(eventmessage, &ostream);
+  std::string message = ostream.str();
   message.erase(std::remove_if(message.begin(), message.end(), 
                 [](unsigned char x){return std::iscntrl(x);}));
   return message;