Many thanks @benfleet5 and @borba0 for your invaluable help. Now i printed all instruction and i hope to not wrong something. but I need to upgrade to RC8 and then downgrade to RC6.1?You are on the same RC as I am (RC7). You need to downgrade using the correct firmware as @borba0 has suggested. Once you have done this you should be able to install permissions etc.
Process - this is the process for RC8 but they are all the same
Downgrading - this is the link for downgrading
Downgrading - another link for downgrading information
You can find the LHD matrix on page 155 of this thread to see what files you need