diff --git a/Htmldocs/release_notes.html b/Htmldocs/release_notes.html
index c366eed3..bdb26588 100644
--- a/Htmldocs/release_notes.html
+++ b/Htmldocs/release_notes.html
@@ -11,6 +11,17 @@
     <b>This page in other languages:</b>
     <br><a href=http://www.apneaboard.com/wiki/index.php/OSCAR_Release_Notes>http://www.apneaboard.com/wiki/index.php/OSCAR_Release_Notes</a></p>
     <p>
+    <b>Changes and fixes in OSCAR v1.4.0-beta-2</b>
+    <br>Portions of OSCAR are © 2019-2022 by
+    <i>The OSCAR Team</i></p>
+    <ul>
+      <li>[new] Additional Philips Respironics devices tested and fully supported:
+        <ul>
+          <li>DreamStation 2 Advanced CPAP (420X150C)</li>
+        </ul>
+      </li>
+    </ul>
+    <p>
     <b>Changes and fixes in OSCAR v1.4.0-beta-1</b>
     <br>Portions of OSCAR are © 2019-2022 by
     <i>The OSCAR Team</i></p>
@@ -18,9 +29,8 @@
       <li>[new] Additional Philips Respironics devices tested and fully supported:
         <ul>
           <li>DreamStation 2 CPAP (410X150C)</li>
-          <li>DreamStation 2 Auto CPAP Advanced (520X130C)</li>
-          <li>DreamStation 2 Auto CPAP Advanced (520X110C, 520X150C)</li>
-          <li>DreamStation 2 Auto CPAP Advanced with P-Flex (521X120C)</li>
+          <li>DreamStation 2 Auto CPAP Advanced (520X110C, 520X130C, 520X150C)</li>
+          <li>DreamStation 2 Auto CPAP Advanced with P-Flex (521X120C, 521X140C)</li>
           <li>BiPAP Auto (System One 60 Series) (761P)</li>
           <li>BiPAP autoSV Advanced 30 (System One 60 Series) (961TCA)</li>
           <li>REMstar Auto (System One) (552P)</li>
@@ -30,7 +40,7 @@
       <li>[fix] Fixed pressure settings scale on BiPAP autoSV Advanced 30 (System One 60 Series) (960T).</li>
       <li>[fix] File Export Sessions now exports statistics session data properly.</li>
       <li>[fix] Fixed a rare crash on import when encountering corrupted Philips Respironics directories.</li>
-      <li>[new] Test Mantis integration.</li>
+      <li>[fix] Fixed an incorrect warning message when importing some CheckMe O2 Max data.</li>
     </ul>
     <p>
     <b>Changes and fixes in OSCAR v1.3.1</b>
diff --git a/oscar/SleepLib/loader_plugins/prs1_loader.cpp b/oscar/SleepLib/loader_plugins/prs1_loader.cpp
index 97dfefb0..59a7d59d 100644
--- a/oscar/SleepLib/loader_plugins/prs1_loader.cpp
+++ b/oscar/SleepLib/loader_plugins/prs1_loader.cpp
@@ -134,6 +134,7 @@ static const PRS1TestedModel s_PRS1TestedModels[] = {
     { "700X150", 0, 6, "DreamStation Auto BiPAP" },
     
     { "410X150C", 0, 6, "DreamStation 2 CPAP" },
+    { "420X150C", 0, 6, "DreamStation 2 Advanced CPAP" },  // from FDA filing
     { "520X110C", 0, 6, "DreamStation 2 Auto CPAP Advanced" },  // based on bottom label, boot screen says "Advanced Auto CPAP"
     { "520X130C", 0, 6, "DreamStation 2 Auto CPAP Advanced" },  // from user report
     { "520X150C", 0, 6, "DreamStation 2 Auto CPAP Advanced" },  // from user report
diff --git a/oscar/SleepLib/loader_plugins/prs1_parser_xpap.cpp b/oscar/SleepLib/loader_plugins/prs1_parser_xpap.cpp
index 5e823db5..76a52012 100644
--- a/oscar/SleepLib/loader_plugins/prs1_parser_xpap.cpp
+++ b/oscar/SleepLib/loader_plugins/prs1_parser_xpap.cpp
@@ -2078,7 +2078,7 @@ bool PRS1DataChunk::ParseSettingsF0V6(const unsigned char* data, int size)
                 // TODO: Confirm that 4 is 12HT and update ParseTubingTypeV3.
                 this->ParseTubingTypeV3(data[pos]);
                 break;
-            case 0x48:  // ??? Seen on DreamStation 2 non-Advanced (410)
+            case 0x48:  // ??? Seen on DreamStation 2 non-Advanced (410) but not either Advanced (420 or 520)
                 // Appears between 0x2C (ramp time) and 0x2E (flex mode), with a value of 0-4.
                 CHECK_VALUE(len, 1);
                 if (data[pos] > 4) {