diff --git a/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/SubGigRadio.c b/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/SubGigRadio.c
index 6ad6c775..a0361daf 100644
--- a/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/SubGigRadio.c
+++ b/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/SubGigRadio.c
@@ -13,13 +13,15 @@
 
 #include "radio.h"
 #include "proto.h"
+#include "utils.h"
+#include "second_uart.h"
 #include "cc1101_radio.h"
 #include "SubGigRadio.h"
 
 void DumpHex(void *AdrIn,int Len);
+bool CC1101_QuickCheck(void);
 
-#define LOGE(format, ... ) \
-   printf("%s#%d: " format,__FUNCTION__,__LINE__,## __VA_ARGS__)
+#define wait_Miso(level) CC1101_WaitMISO(__FUNCTION__,__LINE__,level)
 
 #if 0
 #define LOG(format, ... ) printf("%s: " format,__FUNCTION__,## __VA_ARGS__)
@@ -31,7 +33,6 @@ void DumpHex(void *AdrIn,int Len);
 #define LOG_HEX(x,y)
 #endif
 
-
 // SPI Stuff
 #if CONFIG_SPI2_HOST
    #define HOST_ID SPI2_HOST
@@ -39,6 +40,9 @@ void DumpHex(void *AdrIn,int Len);
    #define HOST_ID SPI3_HOST
 #endif
 
+// Wait for up to 2 milliseconds for MISO to go low
+#define MISO_WAIT_TIMEOUT  2
+
 // Address Config = No address check 
 // Base Frequency = xxx.xxx
 // CRC Enable = false 
@@ -247,10 +251,10 @@ SubGigErr SubGig_radio_init(uint8_t ch)
    SubGigErr Ret = SUBGIG_ERR_NONE;
 
    do {
-      gpio_reset_pin(CONFIG_CSN_GPIO);
-      gpio_set_direction(CONFIG_CSN_GPIO, GPIO_MODE_OUTPUT);
-      gpio_set_level(CONFIG_CSN_GPIO, 1);
-
+      if(!CC1101_QuickCheck()) {
+         Ret = SUBGIG_CC1101_NOT_FOUND;
+         break;
+      }
       spi_bus_config_t buscfg = {
          .sclk_io_num = CONFIG_SCK_GPIO,
          .mosi_io_num = CONFIG_MOSI_GPIO,
@@ -297,6 +301,7 @@ SubGigErr SubGig_radio_init(uint8_t ch)
       }
       // Check Chip ID
       if(!CC1101_Present()) {
+         LOGE("CC1101 not detected\n");
          Ret = SUBGIG_CC1101_NOT_FOUND;
          break;
       }
@@ -314,7 +319,7 @@ SubGigErr SubGig_radio_init(uint8_t ch)
    } while(false);
 
    if(ErrLine != 0) {
-      LOG("%s#%d: failed %d\n",__FUNCTION__,ErrLine,Err);
+      LOGA("%s#%d: failed %d\n",__FUNCTION__,ErrLine,Err);
       if(Err == 0) {
          Ret = ESP_FAIL;
       }
@@ -477,7 +482,7 @@ int CheckSubGigState()
    }
 
    if(Err != SUBGIG_ERR_NONE) {
-      LOG("CheckSubGigState: returing %d\n",Err);
+      LOGE("Returning %d\n",Err);
    }
 
    return Err;
@@ -558,5 +563,96 @@ void DumpHex(void *AdrIn,int Len)
       LOG_RAW("\n");
    }
 }
+
+
+// Quick and hopefully safe check if a CC1101 is present.
+// Only the CSN and MISO GPIOs are configured for this test.
+// If they are and there's a CC1101 then MISO should go low when
+// CSN is low
+bool CC1101_QuickCheck()
+{
+// Init CSn and MISO
+   esp_err_t Err = ESP_OK;
+   bool Ret = false;
+   int Line = 0;
+   int MisoLevel;
+
+   do {
+      Err = gpio_reset_pin(CONFIG_MISO_GPIO);
+      if(Err != ESP_OK) {
+         Line = __LINE__;
+         break;
+      }
+      
+      Err = gpio_set_direction(CONFIG_MISO_GPIO,GPIO_MODE_INPUT);
+      if(Err != ESP_OK) {
+         Line = __LINE__;
+         break;
+      }
+
+      Err = gpio_set_pull_mode(CONFIG_MISO_GPIO,GPIO_PULLUP_ONLY);
+      if(Err != ESP_OK) {
+         Line = __LINE__;
+         break;
+      }
+
+      Err = gpio_reset_pin(CONFIG_CSN_GPIO);
+      if(Err != ESP_OK) {
+         Line = __LINE__;
+         break;
+      }
+      Err = gpio_set_direction(CONFIG_CSN_GPIO,GPIO_MODE_OUTPUT);
+      if(Err != ESP_OK) {
+         Line = __LINE__;
+         break;
+      }
+      Err = gpio_set_level(CONFIG_CSN_GPIO,1);
+      if(Err != ESP_OK) {
+         Line = __LINE__;
+         break;
+      }
+
+   // The CC1101 is not selected and MISO has a pullup so it should be high
+      if(wait_Miso(1) != 1) {
+         LOGA("Error: SubGhz MISO stuck low\n");
+         break;
+      }
+   // Select the CC1101
+      Err = gpio_set_level(CONFIG_CSN_GPIO,0);
+      if(Err != ESP_OK) {
+         Line = __LINE__;
+         break;
+      }
+      MisoLevel = wait_Miso(0);
+
+   // Deselect the CC1101
+      Err = gpio_set_level(CONFIG_CSN_GPIO,1);
+      if(Err != ESP_OK) {
+         Line = __LINE__;
+         break;
+      }
+
+      if(MisoLevel == 0) {
+         Ret = true;
+      }
+   } while(false);
+
+
+   if(Line != 0) {
+      LOGA("%s#%d: gpio call failed (0x%x)\n",__FUNCTION__,__LINE__,Err);
+   }
+
+   if(Ret) {
+   // Disable pullup, it's no longer needed
+      gpio_set_pull_mode(CONFIG_MISO_GPIO,GPIO_FLOATING);
+   }
+   else {
+   // CC1101 not present, deinit MISO and CSn GPIOs
+      LOGE("CC1101 not detected\n");
+      gpio_reset_pin(CONFIG_MISO_GPIO);
+      gpio_reset_pin(CONFIG_CSN_GPIO);
+   }
+   return Ret;
+}
 #endif // CONFIG_OEPL_SUBGIG_SUPPORT
 
diff --git a/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/cc1101_radio.c b/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/cc1101_radio.c
index 13ecaffe..eae99409 100755
--- a/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/cc1101_radio.c
+++ b/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/cc1101_radio.c
@@ -34,18 +34,15 @@
 #include <stdbool.h>
 #include <driver/spi_master.h>
 #include "proto.h"
+#include "utils.h"
+#include "second_uart.h"
 #include "cc1101_radio.h"
 #include "radio.h"
 
 #define ENABLE_LOGGING  0
 
-// LOGA - generic logging, always enabled
-#define LOGA(format, ... ) printf(format,## __VA_ARGS__)
-// LOGE - error logging, always enabled
-#define LOGE(format, ... ) printf("%s: " format,__FUNCTION__,## __VA_ARGS__)
-
 #if ENABLE_LOGGING
-#define LOG(format, ... ) printf("%s: " format,__FUNCTION__,## __VA_ARGS__)
+#define LOG(format, ... ) printf("%s: " format "\r",__FUNCTION__,## __VA_ARGS__)
 #define LOG_RAW(format, ... ) printf(format,## __VA_ARGS__)
 #else
 #define LOG(format, ... )
@@ -197,7 +194,7 @@ uint8_t CC1101_readReg(uint8_t regAddr, uint8_t regType);
 void CC1101_writeReg(uint8_t regAddr, uint8_t value);
 void CC1101_setTxState(void);
 
-void setIdleState(void);
+static void setIdleState(void);
 
 spi_device_handle_t gSpiHndl;
 
@@ -288,7 +285,7 @@ static uint8_t gRfState;
 
 #define cc1101_Select()    gpio_set_level(CONFIG_CSN_GPIO, LOW)
 #define cc1101_Deselect()  gpio_set_level(CONFIG_CSN_GPIO, HIGH)
-#define wait_Miso()        while(gpio_get_level(CONFIG_MISO_GPIO)>0)
+#define wait_Miso()        CC1101_WaitMISO(__FUNCTION__,__LINE__,0)
 #define getGDO0state()     gpio_get_level(CONFIG_GDO0_GPIO)
 #define wait_GDO0_high()   while(!getGDO0state())
 #define wait_GDO0_low()    while(getGDO0state())
@@ -633,14 +630,13 @@ int CC1101_Rx(uint8_t *RxBuf,size_t RxBufLen,uint8_t *pRssi,uint8_t *pLqi)
 // Any data waiting to be read and no overflow?
    do {
       if(rxBytes & CC1101_RXFIFO_OVERFLOW_MASK) {
-         LOGE("RxFifo overflow\n");
+      // This occurs occasionally due to random noise, so do don't log
          Ret = -2;
          break;
       }
 
       if(rxBytes < 2) {
       // should have at least 2 bytes, packet len and one byte of data
-         LOGE("Internal error, rxBytes = %d\n",rxBytes);
          Ret = -2;
          break;
       }
@@ -786,5 +782,24 @@ void CC1101_logState()
    }
 }
 
+
+// Wait for up to 2 milliseconds for MISO to go low
+#define MISO_WAIT_TIMEOUT  2
+int CC1101_WaitMISO(const char *Func,int Line,int level)
+{
+   uint32_t Start = getMillis();
+   int MisoLevel;
+   
+   while((MisoLevel = gpio_get_level(CONFIG_MISO_GPIO)) != level) {
+      if((getMillis() - Start) >= MISO_WAIT_TIMEOUT) {
+         LOGA("%s#%d: timeout waiting for MISO to go %s\n",
+              Func,Line,level ? "high" : "low");
+         break;
+      }
+   }
+
+   return MisoLevel;
+}
+
 #endif // CONFIG_OEPL_SUBGIG_SUPPORT
 
diff --git a/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/cc1101_radio.h b/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/cc1101_radio.h
index a8335be6..84fe8ebb 100755
--- a/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/cc1101_radio.h
+++ b/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/cc1101_radio.h
@@ -29,6 +29,14 @@
 #ifndef __CC1101_RADIO_H_
 #define __CC1101_RADIO_H_
 
+// Log to all
+#define LOGA(format, ... ) \
+   uart_printf(format "\r",## __VA_ARGS__)
+
+// Error log to all
+#define LOGE(format, ... ) \
+   uart_printf("%s#%d: " format "\r",__FUNCTION__,__LINE__,## __VA_ARGS__)
+
 /**
  * CC1101 configuration registers
  */
@@ -113,6 +121,7 @@ void CC1101_DumpRegs(void);
 void CC1101_reset(void);
 void CC1101_logState(void);
 void CC1101_setRxState(void);
+int CC1101_WaitMISO(const char *Func,int Line,int level);
 
 #endif   // __CC1101_RADIO_H_
 
diff --git a/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/main.c b/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/main.c
index 5bdf865e..22287dce 100644
--- a/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/main.c
+++ b/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/main.c
@@ -44,7 +44,7 @@ const uint8_t channelList[6] = {11, 15, 20, 25, 26, 27};
 struct pendingData pendingDataArr[MAX_PENDING_MACS];
 
 // VERSION GOES HERE!
-uint16_t version = 0x001e;
+uint16_t version = 0x001f;
 
 #define RAW_PKT_PADDING 2
 
@@ -474,7 +474,7 @@ void processBlockRequest(const uint8_t *buffer, uint8_t forceBlockDownload) {
             lastBlockRequest = getMillis();
         } else {
             // we're talking to another mac, let this mac know we can't accomodate another request right now
-            pr("BUSY!\n");
+            pr("BUSY!\n\r");
             sendCancelXfer(rxHeader->src);
             return;
         }
@@ -496,9 +496,9 @@ void processBlockRequest(const uint8_t *buffer, uint8_t forceBlockDownload) {
         if (forceBlockDownload) {
             if ((getMillis() - nextBlockAttempt) > 380) {
                 requestDataDownload = true;
-                pr("FORCED\n");
+                pr("FORCED\n\r");
             } else {
-                pr("IGNORED\n");
+                pr("IGNORED\n\r");
             }
         }
     }
@@ -647,7 +647,7 @@ void sendPart(uint8_t partNo) {
 }
 void sendBlockData() {
     if (getBlockDataLength() == 0) {
-        pr("Invalid block request received, 0 parts..\n");
+        pr("Invalid block request received, 0 parts..\n\r");
         requestedData.requestedParts[0] |= 0x01;
     }
 
@@ -660,7 +660,7 @@ void sendBlockData() {
             pr(".");
         }
     }
-    pr("\n");
+    pr("\n\r");
 
     uint8_t partNo = 0;
     while (partNo < BLOCK_MAX_PARTS) {
diff --git a/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/radio.c b/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/radio.c
index d8bb3d0f..da5748dd 100644
--- a/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/radio.c
+++ b/ARM_Tag_FW/OpenEPaperLink_esp32_C6_AP/main/radio.c
@@ -54,7 +54,11 @@ void esp_ieee802154_transmit_failed(const uint8_t *frame, esp_ieee802154_tx_erro
 void esp_ieee802154_transmit_done(const uint8_t *frame, const uint8_t *ack, esp_ieee802154_frame_info_t *ack_frame_info) {
     isInTransmit = 0;
     ESP_EARLY_LOGI(TAG, "TX %d", frame[0]);
-   esp_ieee802154_receive_handle_done(ack);
+    if(ack != NULL) {
+       if(esp_ieee802154_receive_handle_done(ack)) {
+          ESP_EARLY_LOGI(TAG, "esp_ieee802154_receive_handle_done() failed");
+       }
+    }
 }
 static bool zigbee_is_enabled = false;
 void radio_init(uint8_t ch) {