I have an Australian v1.4.5 DSi XL... anyway to hack it.. and I also heard about the TWLtool?
TWLtool: https://gbatemp.net/threads/release-twltool-dsi-downgrading-save-injection-etc-multitool.393488/
TWLtool: https://gbatemp.net/threads/release-twltool-dsi-downgrading-save-injection-etc-multitool.393488/