diff --git a/radio/src/opentx.cpp b/radio/src/opentx.cpp
index ba21b4751..c4666a34d 100644
--- a/radio/src/opentx.cpp
+++ b/radio/src/opentx.cpp
@@ -302,7 +302,9 @@ void generalDefault()
   theme->init();
 #endif
 
-  memcpy(g_eeGeneral.ownerRegistrationID, &cpu_uid[1], PXX2_LEN_REGISTRATION_ID);
+  for (uint8_t i=0; i<PXX2_LEN_REGISTRATION_ID; i++) {
+    g_eeGeneral.ownerRegistrationID[i] = (cpu_uid[1 + i] & 0x3f) - 32;
+  }
 
   g_eeGeneral.chkSum = 0xFFFF;
 }