Resolve CMS50E corrupted record hedaer condition

sleepyhead/SleepLib/loader_plugins/cms50_loader.cpp

@@ -347,7 +347,20 @@ int CMS50Loader::doImportMode()
             } else if (!started_reading) { // have not got a valid trio yet, skip...
                 idx += 1;
             } else {
-                //Completed
+                // scan ahead for another 0xf0 in case it's corrupted..
+                bool resync = false;
+
+                for (int i=idx; i < available; ++i) {
+                    c=(unsigned char)buffer.at(i);
+                    if ((c & 0xf0) == 0xf0) {
+                        idx = i;
+                        resync = true;
+                        break;
+                    }
+                }
+
+                if (!resync) {
+                    // Data transfer has completed
                     finished_import = true;
                     killTimers();
                     m_importing = false;
@@ -358,6 +371,7 @@ int CMS50Loader::doImportMode()
                 }
             }
         }
+    }
 
     if (!started_import) {
         imp_callbacks = 0;