diff --git a/Marlin/Makefile b/Marlin/Makefile
index ca7cacaa6a..e5ba9cb341 100644
--- a/Marlin/Makefile
+++ b/Marlin/Makefile
@@ -63,8 +63,8 @@ HARDWARE_MOTHERBOARD ?= 1020
 
 ifeq ($(OS),Windows_NT)
   # Windows
-  ARDUINO_INSTALL_DIR ?= ${HOME}/Arduino
-  ARDUINO_USER_DIR ?= ${HOME}/Arduino
+  ARDUINO_INSTALL_DIR ?= ${HOME}/AppData/Local/Arduino
+  ARDUINO_USER_DIR ?= ${HOME}/Documents/Arduino
 else
   UNAME_S := $(shell uname -s)
   ifeq ($(UNAME_S),Linux)
@@ -82,11 +82,11 @@ endif
 
 # Arduino source install directory, and version number
 # On most linuxes this will be /usr/share/arduino
-ARDUINO_INSTALL_DIR  ?= ${HOME}/Arduino
-ARDUINO_VERSION      ?= 106
+ARDUINO_INSTALL_DIR  ?= ${HOME}/AppData/Local/Arduino       # C:/Users/${USERNAME}/AppData/Local/Arduino
+ARDUINO_VERSION      ?= 10819
 
 # The installed Libraries are in the User folder
-ARDUINO_USER_DIR ?= ${HOME}/Arduino
+ARDUINO_USER_DIR ?= ${HOME}/Documents/Arduino
 
 # You can optionally set a path to the avr-gcc tools.
 # Requires a trailing slash. For example, /usr/local/avr-gcc/bin/
@@ -656,18 +656,18 @@ ifeq ($(HARDWARE_VARIANT), $(filter $(HARDWARE_VARIANT),arduino Teensy Sanguino)
   # Old libraries (avr-core 1.6.21 < / Arduino < 1.6.8)
   VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/libraries/SPI
   # New libraries (avr-core >= 1.6.21 / Arduino >= 1.6.8)
-  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/libraries/SPI/src
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/arduino/avr/1.8.6/libraries/SPI/src
 endif
 
 ifeq ($(IS_MCU),1)
-  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/cores/arduino
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/arduino/avr/1.8.6/cores/arduino
 
   # Old libraries (avr-core 1.6.21 < / Arduino < 1.6.8)
   VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/libraries/SPI
   VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/libraries/SoftwareSerial
   # New libraries (avr-core >= 1.6.21 / Arduino >= 1.6.8)
-  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/libraries/SPI/src
-  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/libraries/SoftwareSerial/src
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/arduino/avr/1.8.6/libraries/SPI/src
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/arduino/avr/1.8.6/libraries/SoftwareSerial/src
 endif
 
 VPATH += $(ARDUINO_INSTALL_DIR)/libraries/LiquidCrystal/src
@@ -681,17 +681,17 @@ ifeq ($(WIRE), 1)
   VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/libraries/Wire
   VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/libraries/Wire/utility
   # New libraries (avr-core >= 1.6.21 / Arduino >= 1.6.8)
-  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/libraries/Wire/src
-  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/libraries/Wire/src/utility
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/avr/1.8.6/libraries/Wire/src
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/avr/1.8.6/libraries/Wire/src/utility
 endif
 ifeq ($(NEOPIXEL), 1)
 VPATH += $(ARDUINO_INSTALL_DIR)/libraries/Adafruit_NeoPixel
 endif
 ifeq ($(U8GLIB), 1)
-VPATH += $(ARDUINO_INSTALL_DIR)/libraries/U8glib
-VPATH += $(ARDUINO_INSTALL_DIR)/libraries/U8glib/csrc
-VPATH += $(ARDUINO_INSTALL_DIR)/libraries/U8glib/cppsrc
-VPATH += $(ARDUINO_INSTALL_DIR)/libraries/U8glib/fntsrc
+VPATH += $(ARDUINO_INSTALL_DIR)/libraries/U8glib-HAL
+VPATH += $(ARDUINO_INSTALL_DIR)/libraries/U8glib-HAL/src
+# VPATH += $(ARDUINO_INSTALL_DIR)/libraries/U8glib
+# VPATH += $(ARDUINO_INSTALL_DIR)/libraries/U8glib/src
 endif
 ifeq ($(TMC), 1)
 VPATH += $(ARDUINO_INSTALL_DIR)/libraries/TMCStepper/src
@@ -700,9 +700,9 @@ endif
 
 ifeq ($(HARDWARE_VARIANT), arduino)
   HARDWARE_SUB_VARIANT ?= mega
-  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/arduino/avr/variants/$(HARDWARE_SUB_VARIANT)
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/avr/1.8.6/variants/$(HARDWARE_SUB_VARIANT)
 else ifeq ($(HARDWARE_VARIANT), Sanguino)
-  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/marlin/avr/variants/sanguino
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/avr/1.8.6/variants/sanguino
 else ifeq ($(HARDWARE_VARIANT), archim)
   VPATH   += $(ARDUINO_INSTALL_DIR)/packages/ultimachine/hardware/sam/1.6.9-b/system/libsam
   VPATH   += $(ARDUINO_INSTALL_DIR)/packages/ultimachine/hardware/sam/1.6.9-b/system/CMSIS/CMSIS/Include/
@@ -718,7 +718,7 @@ else ifeq ($(HARDWARE_VARIANT), archim)
   LDLIBS   = $(ARDUINO_INSTALL_DIR)/packages/ultimachine/hardware/sam/1.6.9-b/variants/archim/libsam_sam3x8e_gcc_rel.a
 else
   HARDWARE_SUB_VARIANT ?= standard
-  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/$(HARDWARE_VARIANT)/variants/$(HARDWARE_SUB_VARIANT)
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/avr/1.8.6/variants/$(HARDWARE_SUB_VARIANT)
 endif
 
 LIB_SRC = wiring.c \
@@ -733,7 +733,7 @@ endif
 
 ifeq ($(HARDWARE_VARIANT), Teensy)
   LIB_SRC = wiring.c
-  VPATH += $(ARDUINO_INSTALL_DIR)/hardware/teensy/cores/teensy
+  VPATH += $(ARDUINO_INSTALL_DIR)/packages/arduino/hardware/teensy/cores/teensy
 endif
 
 LIB_CXXSRC = WMath.cpp WString.cpp Print.cpp SPI.cpp
@@ -880,7 +880,7 @@ AVRDUDE_WRITE_FLASH = -Uflash:w:$(BUILD_DIR)/$(TARGET).hex:i
 ifeq ($(shell uname -s), Linux)
   AVRDUDE_CONF = /etc/avrdude/avrdude.conf
 else
-  AVRDUDE_CONF = $(ARDUINO_INSTALL_DIR)/hardware/tools/avr/etc/avrdude.conf
+  AVRDUDE_CONF = $(ARDUINO_INSTALL_DIR)/packages/arduino/tools/avrdude/6.3.0-arduino17/etc/avrdude.conf
 endif
 AVRDUDE_FLAGS = -D -C$(AVRDUDE_CONF) \
   -p$(PROG_MCU) -P$(AVRDUDE_PORT) -c$(AVRDUDE_PROGRAMMER) \
diff --git a/Marlin/src/feature/bedlevel/ubl/ubl.h b/Marlin/src/feature/bedlevel/ubl/ubl.h
index f751ce40d0..7377f7dfc0 100644
--- a/Marlin/src/feature/bedlevel/ubl/ubl.h
+++ b/Marlin/src/feature/bedlevel/ubl/ubl.h
@@ -77,7 +77,6 @@ private:
   static bool G29_parse_parameters() __O0;
   static void shift_mesh_height();
   static void probe_entire_mesh(const xy_pos_t &near, const bool do_ubl_mesh_map, const bool stow_probe, const bool do_furthest) __O0;
-  static void tilt_mesh_based_on_3pts(const_float_t z1, const_float_t z2, const_float_t z3);
   static void tilt_mesh_based_on_probed_grid(const bool do_ubl_mesh_map);
   static bool smart_fill_one(const uint8_t x, const uint8_t y, const int8_t xdir, const int8_t ydir);
   static bool smart_fill_one(const xy_uint8_t &pos, const xy_uint8_t &dir) {
diff --git a/Marlin/src/inc/Conditionals_adv.h b/Marlin/src/inc/Conditionals_adv.h
index 4892ff24b1..d5f4be18b9 100644
--- a/Marlin/src/inc/Conditionals_adv.h
+++ b/Marlin/src/inc/Conditionals_adv.h
@@ -306,21 +306,22 @@
  */
 
 // Temperature sensor IDs
-#define HID_REDUNDANT -7
-#define HID_SOC       -6
-#define HID_BOARD     -5
-#define HID_COOLER    -4
-#define HID_PROBE     -3
-#define HID_CHAMBER   -2
-#define HID_BED       -1
-#define HID_E0         0
-#define HID_E1         1
-#define HID_E2         2
-#define HID_E3         3
-#define HID_E4         4
-#define HID_E5         5
-#define HID_E6         6
-#define HID_E7         7
+#define H_NONE    -128
+#define H_REDUNDANT -7
+#define H_SOC       -6
+#define H_BOARD     -5
+#define H_COOLER    -4
+#define H_PROBE     -3
+#define H_CHAMBER   -2
+#define H_BED       -1
+#define H_E0         0
+#define H_E1         1
+#define H_E2         2
+#define H_E3         3
+#define H_E4         4
+#define H_E5         5
+#define H_E6         6
+#define H_E7         7
 
 #define _SENSOR_IS(I,N) || (TEMP_SENSOR(N) == I)
 #define _E_SENSOR_IS(I,N) _SENSOR_IS(N,I)
@@ -333,7 +334,7 @@
 #endif
 
 #if TEMP_SENSOR_REDUNDANT
-  #define _HEATER_ID(M) HID_##M
+  #define _HEATER_ID(M) H_##M
   #define HEATER_ID(M)  _HEATER_ID(M)
   #define REDUNDANT_TEMP_MATCH(M,N) (HEATER_ID(TEMP_SENSOR_REDUNDANT_##M) == _HEATER_ID(N))
 #else
diff --git a/Marlin/src/module/temperature.cpp b/Marlin/src/module/temperature.cpp
index a5fdc4f1fb..c38d4968c9 100644
--- a/Marlin/src/module/temperature.cpp
+++ b/Marlin/src/module/temperature.cpp
@@ -2944,7 +2944,7 @@ void Temperature::init() {
         temp_range[NR].raw_max -= TEMPDIR(NR) * (OVERSAMPLENR); \
     }while(0)
 
-    #define _MINMAX_TEST(N,M) (!TEMP_SENSOR_##N##_IS_DUMMY && HOTENDS > N && TEMP_SENSOR_##N##_IS_THERMISTOR && defined(HEATER_##N##_##M##TEMP))
+    #define _MINMAX_TEST(N,M) (!TEMP_SENSOR_##N##_IS_DUMMY && HOTENDS > (N) && TEMP_SENSOR_##N##_IS_THERMISTOR && defined(HEATER_##N##_##M##TEMP))
 
     #if _MINMAX_TEST(0, MIN)
       _TEMP_MIN_E(0);
diff --git a/Marlin/src/module/temperature.h b/Marlin/src/module/temperature.h
index 51fa6f1eff..a8873bf2af 100644
--- a/Marlin/src/module/temperature.h
+++ b/Marlin/src/module/temperature.h
@@ -55,18 +55,7 @@
   #define FAN_IS_M106ABLE(Q) false
 #endif
 
-// Element identifiers. Positive values are hotends. Negative values are other heaters or coolers.
-typedef enum : int_fast8_t {
-  H_REDUNDANT = HID_REDUNDANT,
-  H_COOLER = HID_COOLER,
-  H_PROBE = HID_PROBE,
-  H_BOARD = HID_BOARD,
-  H_SOC = HID_SOC,
-  H_CHAMBER = HID_CHAMBER,
-  H_BED = HID_BED,
-  H_E0 = HID_E0, H_E1, H_E2, H_E3, H_E4, H_E5, H_E6, H_E7,
-  H_NONE = -128
-} heater_id_t;
+typedef int_fast8_t heater_id_t;
 
 /**
  * States for ADC reading in the ISR
diff --git a/buildroot/share/PlatformIO/ldscripts/creality256k.ld b/buildroot/share/PlatformIO/ldscripts/creality256k.ld
new file mode 100644
index 0000000000..1ed03caa0a
--- /dev/null
+++ b/buildroot/share/PlatformIO/ldscripts/creality256k.ld
@@ -0,0 +1,14 @@
+MEMORY
+{
+  ram (rwx) : ORIGIN = 0x20000000, LENGTH = 48K - 40
+  rom (rx)  : ORIGIN = 0x08007000, LENGTH = 256K - 28K
+}
+
+/* Provide memory region aliases for common.inc */
+REGION_ALIAS("REGION_TEXT", rom);
+REGION_ALIAS("REGION_DATA", ram);
+REGION_ALIAS("REGION_BSS", ram);
+REGION_ALIAS("REGION_RODATA", rom);
+
+/* Let common.inc handle the real work. */
+INCLUDE common.inc
diff --git a/ini/stm32f1-maple.ini b/ini/stm32f1-maple.ini
index 6f9ac32e0e..0a8453f307 100644
--- a/ini/stm32f1-maple.ini
+++ b/ini/stm32f1-maple.ini
@@ -111,7 +111,7 @@ lib_deps    = ${env:STM32F103RC_btt_maple.lib_deps}
               USBComposite for STM32F1@0.91
 
 #
-# Creality (STM32F103RET6)
+# Creality 512K (STM32F103RET6)
 #
 [env:STM32F103RE_creality_maple]
 extends              = env:STM32F103RE_maple
@@ -123,13 +123,13 @@ debug_tool           = jlink
 upload_protocol      = jlink
 
 #
-# Creality (STM32F103RCT6)
+# Creality 256K (STM32F103RCT6)
 #
 [env:STM32F103RC_creality_maple]
 extends              = env:STM32F103RC_maple
 build_flags          = ${env:STM32F103RC_maple.build_flags} -DTEMP_TIMER_CHAN=4
 board_build.address  = 0x08007000
-board_build.ldscript = creality.ld
+board_build.ldscript = creality256k.ld
 board_build.rename   = firmware-{date}-{time}.bin
 debug_tool           = jlink
 upload_protocol      = jlink