diff --git a/src/main/drivers/inverter.c b/src/main/drivers/inverter.c
index 967c87680a..336f850865 100644
--- a/src/main/drivers/inverter.c
+++ b/src/main/drivers/inverter.c
@@ -27,11 +27,16 @@
 
 #include "inverter.h"
 
-static const IO_t pin = DEFIO_IO(INVERTER);
+/* 
+    TODO: move this to support multiple inverters on different UARTs etc
+    possibly move to put it in the UART driver itself.
+*/
+static IO_t pin = IO_NONE;
 
 void initInverter(void)
 {
-    IOInit(pin, OWNER_INVERTER, RESOURCE_OUTPUT, 0);
+    pin = IOGetByTag(IO_TAG(INVERTER));
+    IOInit(pin, OWNER_INVERTER, RESOURCE_OUTPUT, 1);
     IOConfigGPIO(pin, IOCFG_OUT_PP);
 
     inverterSet(false);
diff --git a/src/main/target/BLUEJAYF4/hardware_revision.c b/src/main/target/BLUEJAYF4/hardware_revision.c
index 6ed07e16f9..3162e9f487 100644
--- a/src/main/target/BLUEJAYF4/hardware_revision.c
+++ b/src/main/target/BLUEJAYF4/hardware_revision.c
@@ -58,13 +58,26 @@ void detectHardwareRevision(void)
     if (!IORead(pin1)) {
         if (!IORead(pin2)) {
             hardwareRevision = BJF4_REV3A;
-            return;
         }
         hardwareRevision = BJF4_REV3;
-        return;
     }
 
-    hardwareRevision = BJF4_REV2;    
+    if (hardwareRevision == UNKNOWN) {
+        hardwareRevision = BJF4_REV2;
+        return;
+    }
+    
+    /* 
+        enable the UART1 inversion PC9
+        
+        TODO: once param groups are in place, inverter outputs
+        can be moved to be simple IO outputs, and merely set them
+        HI or LO in configuration.
+    */
+    IO_t uart1invert = IOGetByTag(IO_TAG(PC9));
+    IOInit(uart1invert, OWNER_INVERTER, RESOURCE_OUTPUT, 2);
+    IOConfigGPIO(uart1invert, IOCFG_AF_PP);
+    IOLo(uart1invert);    
 }
 
 void updateHardwareRevision(void)