Free up LWAPP memory prior to pre-download of upgrade image.

Hi,
We are looking for a way to automate the freeing up of LWAPP memory space in order to make way for a pre-download of 7.6.110.0 before the final upgrade of the WLC (8500).
There's around 900 APs so doing it manually is undesirable.
Also, a way to report on the APs that are short of space would be very useful too.
Prime Infrastructure is also installed on the network.
Any ideas appreciated.
Phil Ray

802.11n AP and newer have more than enough flash capacity to store two or more IOS (except for 1250).  
If you have 802.11 a/b/g, such as 1130 and 1240, there's nothing you can do.  

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    Directory of flash:/
        2  -rwx       70825  May 29 2013 02:18:31 +00:00  event.log
        3  drwx           0   Mar 1 1993 00:00:12 +00:00  configs
        4  -rwx         280  Apr 24 2014 05:17:21 +00:00  lwapp_officeextend.cfg
        5  -rwx       29996  Apr 28 2014 13:24:13 +00:00  lwapp_non_apspecific_reap.cfg
        6  -rwx       95008  Apr 24 2014 05:17:24 +00:00  lwapp_reap.cfg
        7  drwx         832  May 29 2013 00:23:41 +00:00  ap3g2-k9w8-mx.152-2.JA1
       46  -rwx          64   Mar 1 1993 00:00:34 +00:00  sensord_CSPRNG0
        9  drwx         192   Dec 4 2012 05:00:01 +00:00  ap3g2-rcvk9w8-mx
       47  -rwx          64   Mar 1 1993 00:00:35 +00:00  sensord_CSPRNG1
       48  -rwx         230  Apr 24 2014 05:17:20 +00:00  env_vars
       49  -rwx       60760  Apr 24 2014 05:14:40 +00:00  event.capwap
       51  -rwx        7192  Apr 28 2014 14:04:59 +00:00  private-multiple-fs
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