diff --git a/update_psa_impl b/update_psa_impl
index bc212e7..f0047ad 100755
--- a/update_psa_impl
+++ b/update_psa_impl
@@ -35,42 +35,20 @@ update_psa() {
         exit $?
     fi
 
-    rm -f "$OPKG_CMDS_TMP"
-    rm -f "$GIT_PULL_TMP"
-
     update_psa_activated    # message to ISMAS
             
-    local try_update_count=0
     local func="${FUNCNAME[0]}"
 
     log_debug "$func:${LINENO}: fetch/merge updates..."
    
     # Fetch new updates (using git)
-    while :
-    do
-        local repository_is_already_up_to_date=""
-        if ! fetch_customer_updates repository_is_already_up_to_date; then
-            if [ "$repository_is_already_up_to_date" = "yes" ]; then
-                log_error "$func:${LINENO}: $customer_id is up-to-date"\
-                    "-> no files to update -> no psa update"
-                update_psa_false_alarm \
-                    "update request, but no change in $CUSTOMER_REPOSITORY_PATH"
-                exit $?
-            fi
-            try_updates_count=$((try_updates_count+1))
-            if [[ "$try_updates_count" -eq 5 ]]; then
-                log_error "$func:${LINENO}: fetch/merging failed"
-                update_psa_pull_error # message to ISMAS
-                exit $?
-            fi
-            update_psa_pull_error # message to ISMAS
-            sleep 10s
-        else
-            # Fetched updates successfully 
-            try_updates_count=0
-            break
-        fi
-    done
+    if ! fetch_customer_updates; then
+        log_error "$func:${LINENO}: fetch no data for $customer_id"\
+            "-> no files to update -> no psa update"
+        update_psa_false_alarm \
+            "update request, but no change in $CUSTOMER_REPOSITORY_PATH"
+        # TODO
+    fi
             
     update_psa_pull_customer_repository # message to ISMAS
 
@@ -78,7 +56,7 @@ update_psa() {
     
     # local changed_files=$(changed_file_names)
    
-    if [[ ! -z $GIT_PULL_TMP ]]; then 
+    if [[ -f "$GIT_PULL_TMP" ]]; then 
         # TODO
         if ! check_hardware_compatibility "$files_to_copy" ; then
             local __r=$?
@@ -88,7 +66,7 @@ update_psa() {
         fi
     fi
 
-    if [[ ! -z "$OPKG_CMDS_TMP" ]]; then
+    if [[ -f "$OPKG_CMDS_TMP" ]]; then
         local commands="$(cat ${OPKG_CMDS_TMP} | tr '\n' '; ')"
         log_info "$func:${LINENO}: executed opkg commands"
         update_psa_install_opkg_packages $UPDATE_ISMAS_PROGRESS \
@@ -158,6 +136,7 @@ update_psa() {
     update_psa_cleanup $UPDATE_ISMAS_PROGRESS \
         $RC_SUCCESS "cleanup after psa update"
 
+    # TODO
     exit 0
 }