catalyst 2950 problem copyng new sustem immage after "errase flash"

hi all,
i have a problem.

i recently bought a stock of 20 catalyst 2950 but some of the are completely formatted.

i tried doing this:
switch: flah_init
Unknown cmd: flah_init
switch: flash_init
Initializing Flash...
...The flash is already initialized.
switch: load_helper
switch: dir_flash
Unknown cmd: dir_flash
switch: dir flash:
Directory of flash:/


7740416 bytes available (1024 bytes used)
switch: copy xcopy:c2950-i6k2l2q4-mz.121-22.EA13.bin flash:c2950-i6k2l2q4-mz.121-22.EA13.bin
xcopy:c2950-i6k2l2q4-mz.121-22.EA13.bin: permission denied
switch: set
switch: ?
           ? -- Present list of available commands
        boot -- Load and boot an executable image
         cat -- Concatenate (type) file(s)
        copy -- Copy a file
      delete -- Delete file(s)
         dir -- List files in directories
  flash_init -- Initialize flash filesystem(s)
      format -- Format a filesystem
        fsck -- Check filesystem consistency
        help -- Present list of available commands
 load_helper -- Load and initialize a helper image
      memory -- Present memory heap utilization information
       mkdir -- Create dir(s)
        more -- Concatenate (display) file(s)
      rename -- Rename a file
       reset -- Reset the system
       rmdir -- Delete empty dir(s)
         set -- Set or display environment variables
   set_param -- Set system parameters in flash
        trap -- Cause a software breakpoint to occur
        type -- Concatenate (type) file(s)
 -- MORE --
       unset -- Unset one or more environment variables
     version -- Display boot loader version
switch:


but as you see it keep sayng permission denied when i do xcopy....
any idea?