if you flash cm7/miui on chinese sbf ,the led flash light will deed
if you falsh cm7/miui on other sbf(not chinese sbf),it's ok
BUT if you flash other sbf,you cannot downgrade to chinese sbf
it's ok to flash all stock roms,and all offical sbf
look here
http://direct.motorola.com/ENA/SoftwareUpdateSummary.asp?country=AUS&language=ENA&web_page_name=SUPPORT&strCarrierId=&strPhone=MOTODEFY(android100)&strCable=Micro USB Data Cable&strURL=No URL