|Hey all of you :|
To fixing the FTP Permission denied 550 :
you have to downloading this software " putty "
link to download the software :
it makes you able to run a shell commands
then enter you ftp ID
next run this command
chown -cR username /home/username/public_html/url
username = your ftp account user name
url=link to the folder ro file that you wanna delete or edit or ......
for thos who use joomla you could use this component : com_joomlaxplorer
it will be easy for you to edit uplode download changing permission from joomla it self link to
download this component :