diff --git a/.travis.yml b/.travis.yml
index 8a080d5..9e0d917 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -52,8 +52,12 @@ install:
   - arduino --install-library "GFX Library for Arduino"
 script:
   - arduino --board esp32:esp32:t-beam --verify $PWD/RX_FSK/RX_FSK.ino
-  - find build
-  - find /home/travis/.arduino15/packages/esp32/hardware/esp32/
+  - ESPPATH=`arduino --get-pref runtime.tools.xtensa-esp32-elf-gcc.path`
+  - $ESPPATH/bin/xtensa-esp32-elf-c++ -c RX_FSK/src/fonts/fonts.cpp -o /tmp/fonts.o
+  - $ESPPATH/bin/xtensa-esp32-elf-ld -T fontlink.ld --oformat=binary -o /tmp/fonts.bin /tmp/fonts.o
+  - ls -la /tmp/fonts.bin
+  #- find build
+  #- find /home/travis/.arduino15/packages/esp32/hardware/esp32/
   - $PWD/scripts/makeimage.py $ESP32TOOLS $PWD/build/RX_FSK.ino.bin $PWD/RX_FSK/data $PWD/out.bin
 after_success:
   - .travis/push.sh  
diff --git a/RX_FSK/src/RS41.cpp b/RX_FSK/src/RS41.cpp
index ce6768d..9a9668a 100644
--- a/RX_FSK/src/RS41.cpp
+++ b/RX_FSK/src/RS41.cpp
@@ -613,7 +613,7 @@ float GetRATemp( uint32_t measuredCurrent, uint32_t refMin, uint32_t refMax, flo
 }
 
 // taken from https://github.com/einergehtnochrein/ra-firmware
-float GetRAHumidity( uint32_t humCurrent, uint32_t humMin, uint32_t humMax, float sensorTemp, float externalTemp ) {
+float GetRAHumidity( uint32_t humCurrent, uint32_t humMin, uint32_t humMax, float sensorTemp, float externalTemp, float pressure ) {
    struct subframeBuffer *calibration = (struct subframeBuffer *)sonde.si()->extra;
    float current = float( humCurrent - humMin) / float( humMax - humMin );
    /* Compute absolute capacitance from the known references */
@@ -624,12 +624,15 @@ float GetRAHumidity( uint32_t humCurrent, uint32_t humMin, uint32_t humMax, floa
    float Cp = ( C / calibration->value.calibU[0] - 1.0f) * calibration->value.calibU[1];
 
    /* Compensation for low temperature and pressure at altitude */
-   float estimatedPressure = 1013.25f * expf(-1.18575919e-4f * sonde.si()->d.alt );
+   if(isnan(pressure)) {
+      // if no pressure is available (non-SGP), estimate based on altitude
+      pressure = 1013.25f * expf(-1.18575919e-4f * sonde.si()->d.alt );
+   }
 
    float Tp = (sensorTemp - 20.0f) / 180.0f;
    float sum = 0;
    float powc = 1.0f;
-   float p = estimatedPressure / 1000.0f;
+   float p = pressure / 1000.0f;
    for ( int i = 0; i < 3; i++) {
       float l = 0;
       float powt = 1.0f;
@@ -792,10 +795,14 @@ int RS41::decode41(byte *data, int maxlen)
                Serial.printf( "Pressure sens: pressureMain = %ld, pressureRef1 = %ld, pressureRef2 = %ld\n", pressureMain, pressureRef1, pressureRef2 );
             #endif
    	    struct subframeBuffer *calibration = (struct subframeBuffer *)(sonde.si()->extra);
-	        // check for bits 3 through 20 set and 37 through 46
+		 // temp: 0xF8==bits 3..7 : we need refResistorlow/high, taylorT, polyT
 	         bool validExternalTemperature = calibration!=NULL && (calibration->valid & 0xF8) == 0xF8;
+
+		 // humidity:  bits 3..20 and 37..46.
+		 // (note: we check validPressure below as well, thus we only calculate humidity of bit 33 (variant) is available as well)
 	         bool validHumidity = calibration!=NULL && (calibration->valid & 0x7FE0001FFFF8) == 0x7FE0001FFFF8;
 
+		 // pressure:  bits 33 and 37..42 (variant; x25..x2a: matrixP)    /// CALIB_P is    0x7E200000000)
 		 bool validPressure = calibration!=NULL && (calibration->valid & CALIB_P)==CALIB_P && calibration->value.names.variant[7]=='P';
 
 	    if ( validPressure ) {
@@ -809,11 +816,11 @@ int RS41::decode41(byte *data, int maxlen)
                Serial.printf("External temperature = %f\n", si->temperature );
             }
 
-            if ( validHumidity && validExternalTemperature ) {
+            if ( validHumidity && validExternalTemperature & validPressure ) {
                si->tempRHSensor = GetRATemp( tempHumiMain, tempHumiRef1, tempHumiRef2, 
                                                     calibration->value.calTU, calibration->value.taylorTU, calibration->value.polyTrh );
                Serial.printf("Humidity Sensor temperature = %f\n", si->tempRHSensor );
-               si->relativeHumidity = GetRAHumidity( humidityMain, humidityRef1, humidityRef2, si->tempRHSensor, si->temperature );
+               si->relativeHumidity = GetRAHumidity( humidityMain, humidityRef1, humidityRef2, si->tempRHSensor, si->temperature, si->pressure );
                Serial.printf("Relative humidity = %f\n", si->relativeHumidity );
             }
          }
diff --git a/RX_FSK/version.h b/RX_FSK/version.h
index 916164c..e1db54f 100644
--- a/RX_FSK/version.h
+++ b/RX_FSK/version.h
@@ -1,4 +1,4 @@
 const char *version_name = "rdzTTGOsonde";
-const char *version_id = "devel20210925";
+const char *version_id = "devel20210926";
 const int SPIFFS_MAJOR=2;
 const int SPIFFS_MINOR=16;
diff --git a/scripts/makeimage.py b/scripts/makeimage.py
index b51d710..ef79ac8 100755
--- a/scripts/makeimage.py
+++ b/scripts/makeimage.py
@@ -1,5 +1,6 @@
 #!/usr/bin/python
 import os
+import os.path
 import sys
 import csv
 import subprocess
@@ -29,6 +30,9 @@ data_dir = sys.argv[3]
 file_out = sys.argv[4]
 
 partition = esp32tools + "/partitions/default.csv"
+if os.path.isfile("RX_FSK/partitions.csv"):
+  partition = "RX_FSK/partitions.csv"
+
 with open(partition, 'rb') as csvfile:
 	partreader = csv.reader(csvfile, delimiter=',')
 	for row in partreader: