Erm, I don't have a DS/Lite/1.4>
Am I screwed?
Some people have borrowed DSLite from GameStop or similar retailers, by purchasing and returning it or by asking nicely
If you can't do that and don't have a friend who can lend you one, then you could buy one that's already updated.
Once you have that you should be able to update the card you already have (by using the other firmware update file intended for unbricking,) by running ak2ifw_update_14_DSL_new.nds on your pre-updated AK2i and then putting your unflashed AK2i in to run it. I'm not 100% sure it's possible to swap carts on a DSi as I've heard conflicting reports though. Dsi will Turn OFF if you do it
Well, according to tk_saturn's guide:
QUOTEThis file only runs on the DS Lite or DS Phat because the DSi will not allow you to eject a cartridge beyond the DSi menu.