diff --git a/docs/boards/Matek F722PX-WPX-HD.md b/docs/boards/Matek F722PX-WPX-HD.md
index f3868b34d8..961ea06323 100644
--- a/docs/boards/Matek F722PX-WPX-HD.md	
+++ b/docs/boards/Matek F722PX-WPX-HD.md	
@@ -13,4 +13,4 @@ Three firmware variants are available.
 * `inav_x.y.z_MATEKF722WPX.hex`
 * `inav_x.y.z_MATEKF722PX_PINIO.hex` 
 
-The WPX vairant is for the MATEK F722-WPX wing flight controller. The PX variants are for the MATEK F722-PX and MATEK F722-HD flight controllers. The PINIO variant adds USER 3 PINIO as a replacement to UART 5 (TX)
\ No newline at end of file
+The WPX vairant is for the MATEK F722-WPX wing flight controller. The PX variants are for the MATEK F722-PX and MATEK F722-HD flight controllers. The PINIO variant adds USER 3 PINIO as a replacement to UART 5 TX and USER 4 PINIO as a replacement to UART 5 RX.
\ No newline at end of file
diff --git a/src/main/fc/fc_msp_box.c b/src/main/fc/fc_msp_box.c
index 2b0df1097a..264f4bbc95 100644
--- a/src/main/fc/fc_msp_box.c
+++ b/src/main/fc/fc_msp_box.c
@@ -96,7 +96,7 @@ static const box_t boxes[CHECKBOX_ITEM_COUNT + 1] = {
     { .boxId = BOXAUTOLEVEL,        .boxName = "AUTO LEVEL",        .permanentId = 54 },
     { .boxId = BOXPLANWPMISSION,    .boxName = "WP PLANNER",        .permanentId = 55 },
     { .boxId = BOXSOARING,          .boxName = "SOARING",           .permanentId = 56 },
-    { .boxId = BOXCHANGEMISSION,    .boxName = "MISSION CHANGE",    .permanentId = 57 },
+    { .boxId = BOXCHANGEMISSION,    .boxName = "MISSION CHANGE",    .permanentId = 59 },
     { .boxId = CHECKBOX_ITEM_COUNT, .boxName = NULL,                .permanentId = 0xFF }
 };
 
diff --git a/src/main/target/MATEKF722PX/config.c b/src/main/target/MATEKF722PX/config.c
index b11914b063..9d1a940c91 100755
--- a/src/main/target/MATEKF722PX/config.c
+++ b/src/main/target/MATEKF722PX/config.c
@@ -33,6 +33,7 @@ void targetConfiguration(void)
     pinioBoxConfigMutable()->permanentId[1] = BOX_PERMANENT_ID_USER2;
 #ifdef MATEKF722PX_PINIO    
     pinioBoxConfigMutable()->permanentId[2] = BOX_PERMANENT_ID_USER3;
+    pinioBoxConfigMutable()->permanentId[3] = BOX_PERMANENT_ID_USER4;
 #endif
 
     serialConfigMutable()->portConfigs[6].functionMask = FUNCTION_FRSKY_OSD;
diff --git a/src/main/target/MATEKF722PX/target.h b/src/main/target/MATEKF722PX/target.h
index 71f820ed45..1cdd17fbfd 100755
--- a/src/main/target/MATEKF722PX/target.h
+++ b/src/main/target/MATEKF722PX/target.h
@@ -158,6 +158,7 @@
 
 #ifdef MATEKF722PX_PINIO
 #define PINIO3_PIN                  PC12 // UART 5 TX - USER 3 PINIO
+#define PINIO4_PIN                  PD2  // UART 5 RX - USER 4 PINIO
 #endif
 
 // *************** LEDSTRIP ************************