diff --git a/Makefile b/Makefile
index c5491fd..cea263f 100644
--- a/Makefile
+++ b/Makefile
@@ -305,7 +305,7 @@ $(info ASFLAGS $(ASFLAGS))
 $(info )
 endif
 
-.PHONY: all clean flash dfu-flash sd erase gdbflash gdb
+.PHONY: all clean flash dfu-flash sd gdbflash gdb
 
 # default target to build
 all: $(BUILD)/$(OUT_FILE)-nosd.out $(BUILD)/$(MERGED_FILE).hex
@@ -332,10 +332,6 @@ sd:
 	@echo Flashing: $(SD_HEX)
 	$(NRFJPROG) --program $(SD_HEX) -f nrf52 --chiperase  --reset
 
-erase:
-	@echo Erasing chip
-	$(NRFJPROG) --eraseall -f nrf52
-
 gdbflash: $(BUILD)/$(MERGED_FILE).hex
 	@echo Flashing: $<
 	@$(GDB_BMP) -nx --batch -ex 'load $<' -ex 'compare-sections' -ex 'kill'
@@ -369,7 +365,7 @@ $(BUILD)/$(OUT_FILE)-nosd.out: $(BUILD) $(OBJECTS)
 	@$(SIZE) $@
 
 #------------------- Binary generator -------------------
-.PHONY: genhex genpkg combinehex
+.PHONY: genhex genpkg
 
 ## Create binary .hex file from the .out file
 genhex: $(BUILD)/$(OUT_FILE)-nosd.hex
@@ -379,8 +375,6 @@ $(BUILD)/$(OUT_FILE)-nosd.hex: $(BUILD)/$(OUT_FILE)-nosd.out
 	@$(OBJCOPY) -O ihex $< $@
 
 # merge bootloader and sd hex together
-combinehex: $(BUILD)/$(MERGED_FILE).hex
-
 $(BUILD)/$(MERGED_FILE).hex: $(BUILD)/$(OUT_FILE)-nosd.hex
 	@echo CR $(MERGED_FILE).hex
 	@mergehex -q -m $< $(SD_HEX) -o $@
diff --git a/README.md b/README.md
index 1ff105d..6c65816 100644
--- a/README.md
+++ b/README.md
@@ -105,9 +105,7 @@ both bootloader and the Nordic SoftDevice, you can freely upgrade/downgrade to a
 ## How to compile and build
 
 You should only continue if you are looking to develop bootloader for your own.
-You must have have  a J-Link available to "unbrick" your device.
-
-### Option 1: Build with Makefile
+You must have have a J-Link available to "unbrick" your device.
 
 Prerequisites
 
@@ -117,7 +115,7 @@ Prerequisites
 To build:
 
 ```
-make BOARD=feather_nrf52840_express all combinehex
+make BOARD=feather_nrf52840_express all
 ```
 
 To flash the bootloader with JLink:
@@ -138,12 +136,6 @@ To flash SoftDevice (and chip erase):
 make BOARD=feather_nrf52840_express sd
 ```
 
-To erase all of flash:
-
-```
-make BOARD=feather_nrf52840_express erase
-```
-
 For the list of supported boards, run `make` without `BOARD=` :
 
 ```
@@ -167,13 +159,11 @@ make: *** [_build/main.o] Error 127
 ```
 
 ... you may need to pass the location of the GCC ARM toolchain binaries to `make` using
-the variable `GNU_INSTALL_ROOT` as below:
+the variable `CROSS_COMPILE` as below:
 ```
-$ make GNU_INSTALL_ROOT=/opt/gcc-arm-none-eabi-9-2019-q4-major/bin/ BOARD=feather_nrf52832 all
+$ make CROSS_COMPILE=/opt/gcc-arm-none-eabi-9-2019-q4-major/bin/arm-none-eabi- BOARD=feather_nrf52832 all
 ```
 
-_Please note that the path needs a trailing path separator (a `/`)_
-
 #### 2. `mergehex: No such file or directory`
 
 Make sure that `mergehex` is available from the command-line. This binary is
@@ -184,22 +174,3 @@ part of Nordic's nRF5x Command Line Tools.
 Make sure that `nrfjprog` is available from the command-line. This binary is
 part of Nordic's nRF5x Command Line Tools.
 
-On POSIX-type systems you can temporarily add the path to `nrfjprog` via a
-variation on the following command:
-
-```
-$ export PATH=$PATH:/location/of/nRF5x-Command-Line-Tools_9_7_2_OSX/nrfjprog
-```
-
-### Option 2: Build using Segger Embedded Studio
-
-For easier debugging you can also use [SES](https://www.segger.com/products/development-tools/embedded-studio/).
-The project file is located at `src/segger/Adafruit_nRF52_Bootloader.emProject`.
-
-> **Note**: SES only flashes the bootloader when you click download, not the SoftDevice.
-You need to flash the SoftDevice beforehand if you haven't already done so.
-As mentioned above do something like:
-
-```
-make BOARD=feather_nrf52840_express sd
-```
diff --git a/tools/build_all.py b/tools/build_all.py
index 0243724..24640f5 100644
--- a/tools/build_all.py
+++ b/tools/build_all.py
@@ -34,7 +34,7 @@ for board in all_boards:
     os.makedirs(bin_directory, exist_ok=True)
 
     start_time = time.monotonic()
-    make_result = subprocess.run("make -j 4 BOARD={} combinehex genpkg".format(board), shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+    make_result = subprocess.run("make -j 4 BOARD={} all genpkg".format(board), shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
     build_duration = time.monotonic() - start_time
 
     flash_size = "-"