diff --git a/libs/core/_locales/core-strings.json b/libs/core/_locales/core-strings.json
index 33649d06..e0ef32da 100644
--- a/libs/core/_locales/core-strings.json
+++ b/libs/core/_locales/core-strings.json
@@ -94,9 +94,7 @@
   "Rotation.Roll|block": "roll",
   "String.charAt|block": "char from %this=text|at %pos",
   "String.compare|block": "compare %this=text| to %that",
-  "String.concat|block": "join %this=text|%other",
   "String.fromCharCode|block": "text from char code %code",
-  "String.isEmpty|block": "%this=text| is empty",
   "String.length|block": "length of %VALUE",
   "String.substr|block": "substring of %this=text|from %start|of length %length",
   "String|block": "String",
diff --git a/libs/core/dal.d.ts b/libs/core/dal.d.ts
index 3d9b5405..28c105e3 100644
--- a/libs/core/dal.d.ts
+++ b/libs/core/dal.d.ts
@@ -192,6 +192,7 @@ declare const enum DAL {
     MICROBIT_SERIAL_EVT_TX_EMPTY = 2,
     MICROBIT_UART_S_EVT_TX_EMPTY = 3,
     // built/yt/yotta_modules/microbit-dal/inc/drivers/CalliopeRGB.h
+    RGB_LED_MAX_INTENSITY = 40,
     // built/yt/yotta_modules/microbit-dal/inc/drivers/CalliopeSoundMotor.h
     CALLIOPE_SM_DEFAULT_DUTY_M = 50,
     CALLIOPE_SM_DEFAULT_DUTY_S = 100,
diff --git a/pxtarget.json b/pxtarget.json
index 9ab99043..56b2f44d 100644
--- a/pxtarget.json
+++ b/pxtarget.json
@@ -171,7 +171,7 @@
         "yottaTarget": "calliope-mini-classic-gcc",
         "yottaCorePackage": "microbit",
         "githubCorePackage": "calliope-mini/microbit",
-        "gittag": "v2.0.0-rc7-calliope-p9",
+        "gittag": "v2.0.0-rc7-calliope-p9-2016-2",
         "serviceId": "calliope"
     },    
     "serial": {