Add missing JLink flashing bits

firmware/Makefile

@@ -214,10 +214,11 @@ flash: $(OUTPUT_BIN)
 	@echo "FLASH $(OUTPUT_BIN)"
 	$(STM32_PROG) --connect port=SWD reset=Hwrst -w $(OUTPUT_BIN) 0x8000000 -v --go
 
+.PHONY: jlink
 jlink: $(OUTPUT_BIN)
 	@echo "FLASH $(OUTPUT_BIN)"
 	JLinkExe -device $$(echo $(DEVICE_TYPE) | tr '[:lower:]' '[:upper:]') -if SWD \
-        -speed auto -autoconnect 1 -CommanderScript cmd.jlink
+        -speed auto -autoconnect 1 -CommanderScript flash.jlink
 
 
 .PHONY: clean

firmware/cmd.jlink

@@ -0,0 +1,6 @@
+exitonerror 1
+h
+r
+loadbin ./watch.bin 0x8000000
+g
+q