gba expansion pack

my gba expansion pack has 32 mb ram ,but it says it only has 25 and 9 mb used,is there any way to delete the files that it has inside to have 32 mb again?
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please can someone tell me if there is any way o delete files that are inside the gba expansion pack

You can't delete RAM!!! RAM is needed to process information on the computer, your GBA games should still work.

the only problem is that on my gba expansion pack it says it has 32 mb of ram,but when i open nintendo ds backup tool it says it only has 25mb and 9 are used