Click sign mode, connect phone to RJ-48 port of se-tool or any uni-FTDI-device and choose comport, click Recovery. After procedure - go in empty tab than choose GDFS.ssw for k550 in tab and click Flash. After that clear gdfs and write Erom in same way like GDFS.ssw - if is GDFS issue for ur problem will be solved.
no need 5 gbp, for 5 minutes i make 20 times more
