diff --git a/pack.inc.php b/pack.inc.php
index 2e665c3..f74a275 100644
--- a/pack.inc.php
+++ b/pack.inc.php
@@ -164,7 +164,7 @@ function _config_pack_bundle_fmt1(
 
     $strid_crc = crc32($entry->strid); 
     if(isset($STRIDMAP[$strid_crc]))
-      throw new Exception("Duplicating config str id crc for '{$entry->strid}' conflicts with '{$STRIDMAP[$strid_crc]}'");
+      throw new Exception("Duplicating config strid CRC for '{$entry->strid}' conflicts with '{$STRIDMAP[$strid_crc]}'");
     $STRIDMAP[$strid_crc] = $entry->strid; 
 
     $header[] = array(
@@ -294,7 +294,7 @@ function _config_pack_bundle_fmt3(
 
     $strid_crc = crc32($entry->strid); 
     if(isset($STRIDMAP[$strid_crc]))
-      throw new Exception("Duplicating config str id crc for '{$entry->strid}' conflicts with '{$STRIDMAP[$strid_crc]}'");
+      throw new Exception("Duplicating config strid CRC for '{$entry->strid}' conflicts with '{$STRIDMAP[$strid_crc]}'");
     $STRIDMAP[$strid_crc] = $entry->strid; 
 
     $header[] = array(
@@ -399,7 +399,23 @@ function _config_patch_bundle_fmt1(
       }
     }
     else
-      throw new Exception("Patched entry {$patch_entry->id} not found in config bundle");
+    {
+      //just append new entry to the end
+      $strid_crc32 = crc32($patch_entry->strid);
+      if(array_filter($header, fn($item) => $item[2] == $strid_crc32)) 
+        throw new Exception("Conflicting CRC for strid: $patch_entry->strid ($strid_crc32)");
+
+      $header[] = array(
+        $patch_format,
+        $patch_entry->id, 
+        $strid_crc32,
+        $patch_entry->class_id, 
+        strlen($payloads_bundle),
+        strlen($patch_payload)
+      );
+
+      $payloads_bundle .= $patch_payload;
+    }
   }
 
   $header_msgpack = config_msgpack_pack($header);
@@ -544,11 +560,13 @@ function _config_patch_bundle_fmt3(
         if(strlen($patch_payload_lz4) <= $lz4_chunk_size)
         {
           $payloads_bundle = substr_replace($payloads_bundle, $patched_chunk, $chunk_offset, strlen($patched_chunk));
+          $header_entry[0] = $patch_format;
           $header_entry[6] = strlen($patch_payload);
         }
         //just append to the end
         else
         {
+          $header_entry[0] = $patch_format;
           $header_entry[4] = strlen($payloads_bundle); //chunk offset
           $header_entry[5] = 0;
           $header_entry[6] = strlen($patch_payload);
@@ -559,6 +577,7 @@ function _config_patch_bundle_fmt3(
       //just append to the end
       else
       {
+        $header_entry[0] = $patch_format;
         $header_entry[4] = strlen($payloads_bundle); //chunk offset
         $header_entry[5] = 0;
         $header_entry[6] = strlen($patch_payload);
@@ -569,7 +588,31 @@ function _config_patch_bundle_fmt3(
       $header[$header_idx] = $header_entry; 
     }
     else
-      throw new Exception("Patched entry {$patch_entry->id} not found in config bundle");
+    {
+      //just append new entry to the end
+      $strid_crc32 = crc32($patch_entry->strid);
+      if(array_filter($header, fn($item) => $item[2] == $strid_crc32)) 
+        throw new Exception("Conflicting CRC for strid: $patch_entry->strid ($strid_crc32)");
+
+      //chunk contains only one patch entry
+      $patch_payload_lz4 = lz4_compress($patch_payload, 9); 
+      $patched_chunk = pack("V", strlen($patch_payload_lz4));
+      $patched_chunk .= $patch_payload_lz4;
+      if(strlen($patch_payload) > $max_chunk_size)
+        $max_chunk_size = strlen($patch_payload);
+
+      $header[] = array(
+        $patch_format,
+        $patch_entry->id, 
+        $strid_crc32,
+        $patch_entry->class_id, 
+        strlen($payloads_bundle),
+        0,
+        strlen($patch_payload)
+      );
+
+      $payloads_bundle .= $patched_chunk;
+    }
   }
 
   $header_msgpack = config_msgpack_pack($header);