For every one who is having the error message to do with no having sufficient rights to remover (rm) the 536ep driver, i have found a viable solution, am not sure if it has been mentioned her or not but I do this:
1, install the precompiled driver and ignore the error.
2, remove the modules from the kernel, and the /dev/536ep is removed.
# rmmod 536ep
# rmmod 536epcore
(remove the core second as the serial driver is dependent on it and therefore it cannot be removed with the serial loaded)
(This even works if you restart your system after installing the driver so don't worry about any script errors)
3, follow the readme file on what to do if the scripts fail, ignoring,
# insmod 536epcore
# insmod 536ep
I know this will work with Mandrake 9.1 but I haven't been able to produce a workable download speed however, am still trying.
i'm only a newbie as you can probably guess and I am posting this to try and help others from avoiding my mistakes.