diff --git a/homematic/CHANGELOG.md b/homematic/CHANGELOG.md
index 7661396..2cb5b32 100644
--- a/homematic/CHANGELOG.md
+++ b/homematic/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 #### WARNING: This add-on is considered to be obsolete/retired in favor of the much more advanced third-party [RaspberryMatic CCU](https://github.com/jens-maus/RaspberryMatic/tree/master/home-assistant-addon) add-on for running a HomeMatic/homematicIP smart home central within HomeAssistant. If you want to migrate to the new add-on, please make sure to update to the latest version of this old "HomeMatic CCU" add-on first and then use the WebUI-based backup routines to export a `*.sbk` config backup file which you can then restore in the new "RaspberryMatic CCU" add-on afterwards (cf. [RaspberryMatic Documentation](https://github.com/jens-maus/RaspberryMatic/wiki/Installation-HomeAssistant))
 
+## 99.0.2
+
+- disabled hmip rf-firmware update to prevent accidently performed
+  firmware downgrade (not required anymore for obsolete addon anyway)
+- added missing gnu.io.rxtx.SerialPorts java option to get hmipserver
+  running with raw-uart device.
+
 ## 99.0.1
 
 - minor bugfix to get webui backup routines running.
diff --git a/homematic/config.yaml b/homematic/config.yaml
index 171730d..eb9dbb1 100644
--- a/homematic/config.yaml
+++ b/homematic/config.yaml
@@ -1,4 +1,4 @@
-version: 99.0.1
+version: 99.0.2
 slug: homematic
 name: HomeMatic CCU
 description: HomeMatic central based on OCCU
diff --git a/homematic/rootfs/etc/cont-init.d/hm_ip.sh b/homematic/rootfs/etc/cont-init.d/hm_ip.sh
index 8d5ac14..aef2b3e 100755
--- a/homematic/rootfs/etc/cont-init.d/hm_ip.sh
+++ b/homematic/rootfs/etc/cont-init.d/hm_ip.sh
@@ -3,10 +3,10 @@
 # Update HomeMatic firmware
 # ==============================================================================
 # shellcheck disable=SC2012
-declare hmip_index
-declare hmip_device
-declare version_to
-declare version_from
+#declare hmip_index
+#declare hmip_device
+#declare version_to
+#declare version_from
 
 # HMIP support
 if bashio::config.false 'hmip_enable'; then
@@ -26,22 +26,22 @@ if [ -f /data/hmip_address.conf ]; then
 fi
 
 # Update Firmware
-for hmip_index in $(bashio::config 'hmip|keys'); do
-    hmip_device=$(bashio::config "hmip[${hmip_index}].device")
-
-    # Skeep device path with id 
-    if echo "${hmip_device}" | grep "by-id"; then
-        bashio::log.warning "Skip firmware for ${hmip_device}"
-        continue
-    fi
-
-    version_from="$(java -Xmx64m -jar /opt/HmIP/hmip-copro-update.jar -p "${hmip_device}" -v | grep "Application version =" | cut -d' ' -f5)"
-    version_to="$(ls /firmware/HmIP-RFUSB/hmip_coprocessor_update-*.eq3 | sed 's/.*hmip_coprocessor_update-\(.*\)\.eq3/\1/' | tail -n1)"
-    if [ "${version_from}" != "${version_to}" ]; then
-        if java -Xmx64m -jar /opt/HmIP/hmip-copro-update.jar -p "${hmip_device}" -f "/firmware/HmIP-RFUSB/hmip_coprocessor_update-${version_to}.eq3"; then
-            bashio::log.info "HmIP update to ${version_to} was successful"
-        else
-            bashio::log.error "HmIP update ${version_to} fails!"
-        fi
-    fi
-done
+#for hmip_index in $(bashio::config 'hmip|keys'); do
+#    hmip_device=$(bashio::config "hmip[${hmip_index}].device")
+#
+#    # Skeep device path with id 
+#    if echo "${hmip_device}" | grep "by-id"; then
+#        bashio::log.warning "Skip firmware for ${hmip_device}"
+#        continue
+#    fi
+#
+#    version_from="$(java -Xmx64m -jar /opt/HmIP/hmip-copro-update.jar -p "${hmip_device}" -v | grep "Application version =" | cut -d' ' -f5)"
+#    version_to="$(ls /firmware/HmIP-RFUSB/hmip_coprocessor_update-*.eq3 | sed 's/.*hmip_coprocessor_update-\(.*\)\.eq3/\1/' | tail -n1)"
+#    if [ "${version_from}" != "${version_to}" ]; then
+#        if java -Xmx64m -jar /opt/HmIP/hmip-copro-update.jar -p "${hmip_device}" -f "/firmware/HmIP-RFUSB/hmip_coprocessor_update-${version_to}.eq3"; then
+#            bashio::log.info "HmIP update to ${version_to} was successful"
+#        else
+#            bashio::log.error "HmIP update ${version_to} fails!"
+#        fi
+#    fi
+#done
diff --git a/homematic/rootfs/etc/services.d/hmserver/run b/homematic/rootfs/etc/services.d/hmserver/run
index 9b4b5f7..6adf03c 100644
--- a/homematic/rootfs/etc/services.d/hmserver/run
+++ b/homematic/rootfs/etc/services.d/hmserver/run
@@ -3,10 +3,12 @@
 # Start HomeMatic HMServer service
 # ==============================================================================
 # shellcheck disable=SC2086
+declare hmip_device
+hmip_device=$(bashio::config "hmip[0].device")
 if bashio::config.true 'hmip_enable'; then
     bashio::log.info "Starting HMIPServer..."
-    exec java -Xmx64m -Dlog4j.configuration=file:///etc/config/log4j.xml -Dfile.encoding=ISO-8859-1 -jar /opt/HMServer/HMIPServer.jar /etc/config/crRFD.conf /etc/config/HMServer.conf
+    exec java -Xmx64m -Dgnu.io.rxtx.SerialPorts="${hmip_device}" -Dlog4j.configuration=file:///etc/config/log4j.xml -Dfile.encoding=ISO-8859-1 -jar /opt/HMServer/HMIPServer.jar /etc/config/crRFD.conf /etc/config/HMServer.conf
 else
     bashio::log.info "Starting HMServer..."
-    exec java -Xmx64m -Dlog4j.configuration=file:///etc/config/log4j.xml -Dfile.encoding=ISO-8859-1 -jar /opt/HMServer/HMServer.jar /etc/config/HMServer.conf
+    exec java -Xmx64m -Dgnu.io.rxtx.SerialPorts="${hmip_device}" -Dlog4j.configuration=file:///etc/config/log4j.xml -Dfile.encoding=ISO-8859-1 -jar /opt/HMServer/HMServer.jar /etc/config/HMServer.conf
 fi