WLC 4402-12-K9 upgrade to 25 access points

Hi everyone,
my customer has an AIR-WLC4402-12-K9 using 12 access point with it, and they would like to increase the number of APs in use. Is there an upgrade option for 25? I couldn't find anything, but I suppose the hardware is the same, it's the software that differs.
If not, can they buy another AIR-WLC4402-12-K9 and connect it to the existing one? Can the software handle to controllers in the same wireless system?
Thanks in advane for all the input!
Peter

Peter,
Sadly the 44xx units are based on AP management - not a software. You could have another AIR-WLC4402-12-K9 and place the secondary in the same mobility group for seemless wireless networking....however if a WLC fails - you have lost the extra 12 AP capacity!
It would probably make sense to by a AIR-WLC4402-25-K9 or even a AIR-WLC4402-50-K9 for future expansion!
HTH.

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here the output of "dir flash:"
dir flash:
Directory of flash:/
2 -rwx 1048 Aug 14 2007 14:29:38 +00:00 private-multiple-fs
3 -rwx 314 Mar 1 2002 00:00:57 +00:00 env_vars
156 drwx 128 Aug 14 2007 14:29:32 +00:00 c1240-rcvk9w8-mx
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15998976 bytes total (11196416 bytes free)
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P70ca.9bd5.77c6#
AP70ca.9bd5.77c6#
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version 6.0
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AP70ca.9bd5.77c6>
AP70ca.9bd5.77c6>
AP70ca.9bd5.77c6>
AP70ca.9bd5.77c6>
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3750X-48P (e05f.b907.9a20)
AP70ca.9bd5.77c6>
AP70ca.9bd5.77c6>
AP70ca.9bd5.77c6>en
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AP70ca.9bd5.77c6#
AP70ca.9bd5.77c6#
AP70ca.9bd5.77c6#
P70ca.9bd5.77c6>
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3750X-48P (e05f.b907.9a20)
AP70ca.9bd5.77c6>
AP70ca.9bd5.77c6>
AP70ca.9bd5.77c6>en
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WLC 4402-12-K9 upgrade to 25 access points

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