diff --git a/apps/renderer.c b/apps/renderer.c
index c49b793058814141cf9fd107ab831b55d433c30c..cfc6c423bd54715ae17305a6eacd3708b9f31b80 100644
--- a/apps/renderer.c
+++ b/apps/renderer.c
@@ -1435,7 +1435,16 @@ int main(
             audioWriter = NULL;
         }
 
+#ifdef FIX_1437_LC3PLUS_EXTREND_HIRES
+        if ( ( error = IVAS_REND_GetSplitRendBitstreamHeader( hIvasRend,
+                                                              &bitsBuffer.config.codec,
+                                                              &bitsBuffer.config.poseCorrection,
+                                                              &bitsBuffer.config.codec_frame_size_ms,
+                                                              &bitsBuffer.config.isar_frame_size_ms,
+                                                              &bitsBuffer.config.lc3plus_highres ) ) != IVAS_ERR_OK )
+#else
         if ( ( error = IVAS_REND_GetSplitRendBitstreamHeader( hIvasRend, &bitsBuffer.config.codec, &bitsBuffer.config.poseCorrection, &bitsBuffer.config.codec_frame_size_ms, &bitsBuffer.config.isar_frame_size_ms ) ) != IVAS_ERR_OK )
+#endif
         {
             fprintf( stderr, "\nError in IVAS_REND_GetSplitRendBitstreamHeader()!\n" );
             goto cleanup;
diff --git a/lib_com/options.h b/lib_com/options.h
index eb37cf314fa900a1b3a4d71712d28ca1830ad771..e73a17f8de5ae06c0bfff3a358e423a3be96fa55 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -202,6 +202,7 @@
 #define NONBE_1412_AVOID_ROUNDING_AZ_ELEV              /* FhG:  Avoid rounding when passing azimuth and elevation to efap_determine_gains() */
 #define NONBE_FIX_NONBE_BETWEEN_OPTIMIZATION_LEVELS    /* FhG: fix non-BE in DFT stereo encoder between optimization levels */
 #define NONBE_FIX_NONBE_BETWEEN_OPTIMIZATION_LEVELS_2  /* FhG: fix even more non-BEnesses */
+#define FIX_1437_LC3PLUS_EXTREND_HIRES                  /* FhG: fix external renderer split bitstream header writing causing a crash for LC3plus High-res mode */
 #define FIX_GAIN_EDIT_LIMITS                           /* Harmonize gain edit limits for all opertation points. For all modes, limit to max +12dB. For parametric modes, limit to min -24dB. */
 
 // object-editing feature porting
diff --git a/lib_isar/isar_splitRendererPre.c b/lib_isar/isar_splitRendererPre.c
index 734daae97719236aa4b692e5948eb65d5393e438..41e82b0598765ad6c79f9f9d75ba16dd8777cb39 100644
--- a/lib_isar/isar_splitRendererPre.c
+++ b/lib_isar/isar_splitRendererPre.c
@@ -1872,6 +1872,9 @@ ivas_error splitRendLc3plusEncodeAndWrite(
     pBits->pose_correction = hSplitBin->multiBinPoseData.poseCorrectionMode;
     pBits->codec_frame_size_ms = (int16_t) ( hSplitBin->hLc3plusEnc->config.lc3plus_frame_duration_us / 1000 );
     pBits->isar_frame_size_ms = (int16_t) ( hSplitBin->hLc3plusEnc->config.isar_frame_duration_us / 1000 );
+#ifdef FIX_1437_LC3PLUS_EXTREND_HIRES
+    pBits->lc3plus_highres = hSplitBin->hLc3plusEnc->config.high_res_mode_enabled;
+#endif
     return IVAS_ERR_OK;
 }
 
diff --git a/lib_rend/lib_rend.c b/lib_rend/lib_rend.c
index d0be488f83b84f2b39ac0d7287f6e3c673db6473..a4af0da9e4ab2285501064f9c6af89452963756f 100644
--- a/lib_rend/lib_rend.c
+++ b/lib_rend/lib_rend.c
@@ -8096,9 +8096,13 @@ ivas_error IVAS_REND_GetSplitRendBitstreamHeader(
     IVAS_REND_HANDLE hIvasRend,                           /* i/o: IVAS renderer handle                                                     */
     ISAR_SPLIT_REND_CODEC *pCodec,                        /* o: pointer to codec setting                */
     ISAR_SPLIT_REND_POSE_CORRECTION_MODE *poseCorrection, /* o: pointer to pose correction mode                */
-    int16_t *pCodec_frame_size_ms                         /* o: pointer to codec frame size setting     */
-    ,
-    int16_t *pIsar_frame_size_ms /* o: pointer to isar frame size setting     */
+    int16_t *pCodec_frame_size_ms,                        /* o: pointer to codec frame size setting     */
+#ifdef FIX_1437_LC3PLUS_EXTREND_HIRES
+    int16_t *pIsar_frame_size_ms, /* o  : pointer to ISAR frame size setting      */
+    int16_t *pLc3plusHighRes      /* o  : pointer to LC3plus High-Res setting     */
+#else
+    int16_t *pIsar_frame_size_ms /* o  : pointer to ISAR frame size setting      */
+#endif
 )
 {
     if ( hIvasRend == NULL || hIvasRend->hRendererConfig == NULL )
@@ -8109,6 +8113,9 @@ ivas_error IVAS_REND_GetSplitRendBitstreamHeader(
     *pCodec_frame_size_ms = hIvasRend->hRendererConfig->split_rend_config.codec_frame_size_ms;
     *pIsar_frame_size_ms = hIvasRend->hRendererConfig->split_rend_config.isar_frame_size_ms;
     *poseCorrection = hIvasRend->hRendererConfig->split_rend_config.poseCorrectionMode;
+#ifdef FIX_1437_LC3PLUS_EXTREND_HIRES
+    *pLc3plusHighRes = hIvasRend->hRendererConfig->split_rend_config.lc3plus_highres;
+#endif
     return IVAS_ERR_OK;
 }
 
diff --git a/lib_rend/lib_rend.h b/lib_rend/lib_rend.h
index 4b6e7340fd99c3cef14ae580255151d15c443811..51637de8b34b4f9a2bffffb50c4e420c7fcc9b59 100644
--- a/lib_rend/lib_rend.h
+++ b/lib_rend/lib_rend.h
@@ -287,7 +287,12 @@ ivas_error IVAS_REND_GetSplitRendBitstreamHeader(
     ISAR_SPLIT_REND_CODEC *pCodec,                  /* o  : pointer to codec setting                            */
     ISAR_SPLIT_REND_POSE_CORRECTION_MODE *poseCorrection,  /* o: pointer to pose correction mode                */
     int16_t *pCodec_frame_size_ms,                  /* o  : pointer to codec frame size setting                 */
-    int16_t *pIsar_frame_size_ms                    /* o  : pointer to isar frame size setting                  */
+#ifdef FIX_1437_LC3PLUS_EXTREND_HIRES
+    int16_t *pIsar_frame_size_ms,                   /* o  : pointer to ISAR frame size setting                  */
+    int16_t *pLc3plusHighRes                        /* o  : pointer to LC3plus High-Res setting                 */
+#else
+    int16_t *pIsar_frame_size_ms                    /* o  : pointer to ISAR frame size setting                  */
+#endif
 );
 
 ivas_error IVAS_REND_SetHeadRotation(