According to a updated news from ak2i team that now ak2i can compatibility DSi V1.44 as well.The official has released a V1.44 updated patch.Cheers ! You can download this patch from here : DSi V1.44 Updated Patch for Ak2I
User Guide
1.Download the latest firmware V1.89 and udpated patch from acekard.com and unzip it,open the folder,then you will get these files _akaio files ,ak2ifw_update_3ds30_dsi144_onDSi_DSXL_3DS.nds , as well as ak2ifw_update_3ds30_dsi144_onDSL.nds.
2.Prepare another lower verison console,such as NDS,or DSi that lower than V1.44 or 3DS.
3.If you use NDS,OR DSL,you need to copy _akaio files and ak2ifw_update_3ds30_dsi144_onDSL.nds to the micro sd card and put it into your ak2i and then power your DSphat or DSL, please eject your AK2i and reinsert it after the update program is running. Then press B, then press START key to finish update.
3. If you using DSi or DSXL or 3DS ,then put _akaio files and ak2ifw_update_3ds30_dsi144_onDSi_DSXL_3DS.nds on your DSi or DSXL or 3DS, please press START key to finish update.
Note : Never update your console before updating your card.