update text info, update genpkg

Author: hathach

platform.txt

@@ -91,7 +91,7 @@ recipe.c.combine.pattern="{compiler.path}{compiler.c.elf.cmd}"  "-L{build.path}"
 recipe.objcopy.hex.pattern="{compiler.path}{compiler.elf2hex.cmd}" {compiler.elf2hex.flags} {compiler.elf2hex.extra_flags} "{build.path}/{build.project_name}.elf" "{build.path}/{build.project_name}.hex"
 
 ## Creat dfu package zip file
-recipe.objcopy.zip.pattern="{build.nrfutil}" dfu genpkg --application "{build.path}/{build.project_name}.hex" "{build.path}/{build.project_name}.zip"
+recipe.objcopy.zip.pattern="{build.nrfutil}" dfu genpkg --dev-type 0x0052 --application "{build.path}/{build.project_name}.hex" "{build.path}/{build.project_name}.zip"
 
 ## Save bin
 recipe.output.tmp_file_bin={build.project_name}.bin

tools/nrfutil-0.5.2/nordicsemi/__main__.py

@@ -287,11 +287,10 @@ def serial(package, port, baudrate, flowcontrol):
         click.echo("Failed to upgrade target. Error is: {0}".format(e.message))
         click.echo("")
         click.echo("Possible causes:")
-        click.echo("- bootloader, SoftDevice or application on target "
+        click.echo("- Bootloader, SoftDevice or Application on target "
                    "does not match the requirements in the DFU package.")
-        click.echo("- baud rate or flow control is not the same as in the target bootloader.")
-        click.echo("- target is not in DFU mode. If using the SDK examples, "
-                   "press Button 4 and RESET and release both to enter DFU mode.")
+        click.echo("- Baud rate must be 115200, Flow control must be off.")
+        click.echo("- Target is not in DFU mode. Ground DFU pin and RESET and release both to enter DFU mode.")
 
         return False