dsl and dsi ... 1.4 update

I understand what the "ak2ifw update 14 DSi" is for.
Can I delete the file after the card is working?What is the "ak2ifw update 14 DSL" for ?
When and why would I use it.I have a DSi and DSL.

You use the DSL file if you want to update the Acekard 2i loader on a DSLite, and you use the DSi file on a DSi that has a firmware lower than 1.4. Yes you can delete the file after.

Thank you