diff --git a/firmware.bin b/firmware.bin
index bc9fe4a..6665e7a 100644
Binary files a/firmware.bin and b/firmware.bin differ
diff --git a/index.html b/index.html
index 034700b..328849c 100644
--- a/index.html
+++ b/index.html
@@ -112,7 +112,7 @@
 <div class="container">
     <h1>EISWOLFS FLIGHTRADAR CYD</h1>
     <div class="subtitle">Firmware Flash Utility</div>
-    <div class="version-badge">Version: v3.6.2</div>
+    <div class="version-badge">Version: v3.6.3</div>
 
     <p>Install the latest Flightradar firmware directly from your browser to your Cheap Yellow Display.</p>
 
diff --git a/src/config.h b/src/config.h
index 2f3aceb..3ff9a78 100644
--- a/src/config.h
+++ b/src/config.h
@@ -6,7 +6,7 @@ namespace Config {
     // CLAUDE.md-Workflow "Standard-Workflow: Push & Release") - erscheint
     // im Info-Screen (Menue > System > Info) und muss zum jeweiligen
     // Git-Tag passen.
-    constexpr const char* APP_VERSION = "3.6.2";
+    constexpr const char* APP_VERSION = "3.6.3";
 
     // Display-Helligkeit (Menue > System > Helligkeit), in Prozent.
     // MIN bewusst nicht 0 - ein komplett dunkles Display koennte sonst wie
diff --git a/src/flight_logbook.cpp b/src/flight_logbook.cpp
index d4e6c79..1003584 100644
--- a/src/flight_logbook.cpp
+++ b/src/flight_logbook.cpp
@@ -92,7 +92,7 @@ namespace {
                 if (buf[i] == '\n') lines++;
             }
             blocksRead++;
-            if (blocksRead % 8 == 0) yield();
+            if (blocksRead % 8 == 0) delay(1);
         }
         return lines;
     }
@@ -141,7 +141,7 @@ namespace {
                 }
             }
             blocksRead++;
-            if (blocksRead % 8 == 0) yield();
+            if (blocksRead % 8 == 0) delay(1);
         }
         f.close();
     }
@@ -284,6 +284,7 @@ TopAltitude todayMaxAltitude() {
     if (!f) return result;
 
     bool firstLine = true;
+    uint32_t lineIdx = 0;
     while (f.available()) {
         String line = f.readStringUntil('\n');
         if (firstLine) { firstLine = false; continue; } // CSV-Header ueberspringen
@@ -315,7 +316,8 @@ TopAltitude todayMaxAltitude() {
             strncpy(result.callsign, callsign.c_str(), sizeof(result.callsign) - 1);
             result.callsign[sizeof(result.callsign) - 1] = 0;
         }
-        yield();
+        lineIdx++;
+        if (lineIdx % 16 == 0) delay(1);
     }
     f.close();