diff --git a/README.md b/README.md
index 8102bd08..ea422e06 100644
--- a/README.md
+++ b/README.md
@@ -44,12 +44,24 @@ In other cases you can contact the developer via email: <img src="https://raw.gi
 **General remark:** Beside the `firmware.bin`, typically also the content of `/html` needs to be updated!
 
 
-##### Rolling - (2021-05-06)
+
+##### Rolling - (2021-05-07)
+
+* Upgrade digital CNN to v8.5.0  (added new images)
+* Updated number format ("2021-05-07T19:04:01")
+* Update MQTT/Error topic to " " in case no error (instead of empty string)
+
+
+Rolling - (2021-05-06)
 
 * Additional MQTT topics: flow rate (units/minute), time stamp last correct readout
+
 * Portrait or landscape image orientation in rotated image
+
 * based on v6.7.2
 
+  
+
 
 ##### 6.7.2 Image Processing in Memory - (2021-05-01)
 
diff --git a/code/components/jomjol_flowcontroll/ClassFlowAlignment.cpp b/code/components/jomjol_flowcontroll/ClassFlowAlignment.cpp
index 1b997288..164d83cf 100644
--- a/code/components/jomjol_flowcontroll/ClassFlowAlignment.cpp
+++ b/code/components/jomjol_flowcontroll/ClassFlowAlignment.cpp
@@ -227,7 +227,7 @@ void ClassFlowAlignment::SaveReferenceAlignmentValues()
         time(&rawtime);
         timeinfo = localtime(&rawtime);
 
-        strftime(buffer, 80, "%Y-%m-%d_%H-%M-%S", timeinfo);
+        strftime(buffer, 80, "%Y-%m-%dT%H:%M:%S", timeinfo);
         zwtime = std::string(buffer);
     }
 
diff --git a/code/components/jomjol_flowcontroll/ClassFlowMQTT.cpp b/code/components/jomjol_flowcontroll/ClassFlowMQTT.cpp
index 77f0b21b..3e75827a 100644
--- a/code/components/jomjol_flowcontroll/ClassFlowMQTT.cpp
+++ b/code/components/jomjol_flowcontroll/ClassFlowMQTT.cpp
@@ -154,6 +154,10 @@ bool ClassFlowMQTT::doFlow(string zwtime)
     MQTTPublish(topic, result);
 
     if (topicError.length() > 0) {
+        if (resulterror.length() == 0)
+        {
+            resulterror = " ";
+        }
         MQTTPublish(topicError, resulterror);
     }
 
diff --git a/code/components/jomjol_flowcontroll/ClassFlowPostProcessing.cpp b/code/components/jomjol_flowcontroll/ClassFlowPostProcessing.cpp
index 18afcc11..e9119239 100644
--- a/code/components/jomjol_flowcontroll/ClassFlowPostProcessing.cpp
+++ b/code/components/jomjol_flowcontroll/ClassFlowPostProcessing.cpp
@@ -63,7 +63,7 @@ bool ClassFlowPostProcessing::LoadPreValue(void)
     int yy, month, dd, hh, mm, ss;
     struct tm whenStart;
 
-    sscanf(zwtime.c_str(), "%d-%d-%d_%d-%d-%d", &yy, &month, &dd, &hh, &mm, &ss);
+    sscanf(zwtime.c_str(), "%d-%d-%dT%d:%d:%d", &yy, &month, &dd, &hh, &mm, &ss);
     whenStart.tm_year = yy - 1900;
     whenStart.tm_mon = month - 1;
     whenStart.tm_mday = dd;
@@ -121,7 +121,7 @@ void ClassFlowPostProcessing::SavePreValue(float value, string zwtime)
         time(&rawtime);
         timeinfo = localtime(&rawtime);
 
-        strftime(buffer, 80, "%Y-%m-%d_%H-%M-%S", timeinfo);
+        strftime(buffer, 80, "%Y-%m-%dT%H:%M:%S", timeinfo);
         timeStamp = std::string(buffer);
     }
     else
@@ -305,7 +305,7 @@ bool ClassFlowPostProcessing::doFlow(string zwtime)
     timeinfo = localtime(&imagetime);
 
     char strftime_buf[64];
-    strftime(strftime_buf, sizeof(strftime_buf), "%Y-%m-%d_%H-%M-%S", timeinfo);
+    strftime(strftime_buf, sizeof(strftime_buf), "%Y-%m-%dT%H:%M:%S", timeinfo);
     zwtime = std::string(strftime_buf);
 
 
@@ -367,14 +367,6 @@ bool ClassFlowPostProcessing::doFlow(string zwtime)
 
     zwvalue = RundeOutput(Value, AnzahlAnalog - DecimalShift);
 
-    time_t currenttime;
-    time(&currenttime);
-    localtime(&currenttime);
-    double difference = difftime(currenttime, lastvalue);      // in Sekunden
-    difference /= 60;                                          // in Minuten
-
-    FlowRateAct = (Value - PreValue) / difference;
-
     if ((!AllowNegativeRates) && (Value < PreValue))
     {
         ErrorMessageText = ErrorMessageText + "Negative Rate - Returned old value - read value: " + zwvalue + " - raw value: " + ReturnRawValue + " - checked value: " + std::to_string(Value) + " "; 
@@ -389,6 +381,7 @@ bool ClassFlowPostProcessing::doFlow(string zwtime)
         zwvalue = RundeOutput(Value, AnzahlAnalog - DecimalShift);
     }
 
+
     ReturnValueNoError = zwvalue;
     ReturnValue = zwvalue;
     if (ErrorMessage && (ErrorMessageText.length() > 0))
@@ -396,10 +389,15 @@ bool ClassFlowPostProcessing::doFlow(string zwtime)
 
     if (ErrorMessageText.length() == 0)
     {
+        time_t currenttime;
+        time(&currenttime);
+        localtime(&currenttime);
+        double difference = difftime(currenttime, lastvalue);      // in Sekunden
+        difference /= 60;                                          // in Minuten
+        FlowRateAct = (Value - PreValue) / difference;
+
         PreValue = Value;
-        
         SavePreValue(Value, zwtime);
-       
     }
     return true;
 }
diff --git a/code/components/jomjol_logfile/ClassLogFile.cpp b/code/components/jomjol_logfile/ClassLogFile.cpp
index f8fbb3fc..71825ca7 100644
--- a/code/components/jomjol_logfile/ClassLogFile.cpp
+++ b/code/components/jomjol_logfile/ClassLogFile.cpp
@@ -77,7 +77,7 @@ void ClassLogFile::WriteToDedicatedFile(std::string _fn, std::string info, bool
             time(&rawtime);
             timeinfo = localtime(&rawtime);
 
-            strftime(buffer, 80, "%Y-%m-%d_%H-%M-%S", timeinfo);
+            strftime(buffer, 80, "%Y-%m-%dT%H:%M:%S", timeinfo);
 
             zwtime = std::string(buffer);
             info = zwtime + ": " + info;
diff --git a/code/main/version.cpp b/code/main/version.cpp
index 68c969ab..418b16b0 100644
--- a/code/main/version.cpp
+++ b/code/main/version.cpp
@@ -1,4 +1,4 @@
-const char* GIT_REV="016f408";
+const char* GIT_REV="67d0bf6";
 const char* GIT_TAG="";
 const char* GIT_BRANCH="rolling";
-const char* BUILD_TIME="2021-05-06 21:42";
\ No newline at end of file
+const char* BUILD_TIME="2021-05-07 21:30";
\ No newline at end of file
diff --git a/code/main/version.h b/code/main/version.h
index 965b1014..dd6bd96b 100644
--- a/code/main/version.h
+++ b/code/main/version.h
@@ -13,7 +13,7 @@ extern "C"
 #include "Helper.h"
 #include <fstream>
 
-const char* GIT_BASE_BRANCH = "master - v6.7.1 - 2020-05-01";
+const char* GIT_BASE_BRANCH = "master - v6.7.2 - 2020-05-01";
 
 
 const char* git_base_branch(void)
diff --git a/code/version.cpp b/code/version.cpp
index 68c969ab..418b16b0 100644
--- a/code/version.cpp
+++ b/code/version.cpp
@@ -1,4 +1,4 @@
-const char* GIT_REV="016f408";
+const char* GIT_REV="67d0bf6";
 const char* GIT_TAG="";
 const char* GIT_BRANCH="rolling";
-const char* BUILD_TIME="2021-05-06 21:42";
\ No newline at end of file
+const char* BUILD_TIME="2021-05-07 21:30";
\ No newline at end of file
diff --git a/firmware/bootloader.bin b/firmware/bootloader.bin
index 069a8b89..1535fe65 100644
Binary files a/firmware/bootloader.bin and b/firmware/bootloader.bin differ
diff --git a/firmware/firmware.bin b/firmware/firmware.bin
index 30c53a89..d48987ba 100644
Binary files a/firmware/firmware.bin and b/firmware/firmware.bin differ
diff --git a/sd-card/config/config.ini b/sd-card/config/config.ini
index 4603df2f..66b30810 100644
--- a/sd-card/config/config.ini
+++ b/sd-card/config/config.ini
@@ -18,7 +18,7 @@ InitialMirror= false
 AlignmentAlgo = Default
 
 [Digits]
-Model = /config/dig0840s1q.tflite
+Model = /config/dig0850s1q.tflite
 ;LogImageLocation = /log/digit
 ;LogfileRetentionInDays = 3
 ModelInputSize = 20 32
diff --git a/sd-card/config/dig0850s1q.tflite b/sd-card/config/dig0850s1q.tflite
new file mode 100644
index 00000000..aab43750
Binary files /dev/null and b/sd-card/config/dig0850s1q.tflite differ