Fixed intermittent init failure on AVR

Config.h

@@ -19,7 +19,7 @@
 	#define CONFIG_H
 
 	#define MAJ_VERS  0x01
-	#define MIN_VERS  0x39
+	#define MIN_VERS  0x3A
 
 	#define PLATFORM_AVR   0x90
     #define PLATFORM_ESP32 0x80

RNode_Firmware.ino

@@ -88,6 +88,9 @@ void setup() {
   // pins for the LoRa module
   LoRa.setPins(pin_cs, pin_reset, pin_dio);
   
+  #if MCU_VARIANT == MCU_ESP32
+    // Check installed transceiver chip and
+    // probe boot parameters.
     if (LoRa.preInit()) {
       sx1276_installed = true;
       uint32_t lfr = LoRa.getFrequency();
@@ -107,6 +110,11 @@ void setup() {
     } else {
       sx1276_installed = false;
     }
+  #else
+    // Older variants only came with SX1276/78 chips,
+    // so assume that to be the case for now.
+    sx1276_installed = true;
+  #endif
 
   #if HAS_DISPLAY
     disp_ready = display_init();