question about installing android on FR

[a dehqan]

In The name Of Allah

hello
have set some enviroments in uboot that is on NAND:
 setenv mtdparts
mtdparts=physmap-flash:-(nor)\;neo1973-nand:0x00040000(u-boot),0x00040000(u-boot_env),0x00800000(kernel),0x000a0000(splash),0x00040000(factory),0x04000000(system),0x0b6a0000(userdata)


and this is result of mtdparts command > http://pastebin.com/2hgCwDgz

but when want to sudo dfu-util -a userdata -R -D userdata.img
dfu says No such Alternate Setting: "userdata"

how to fix it ?

Regards dehqan
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