Well, good news, acekard 2i released the update patch for 3DS2.1 and DSi1.4.3, you can update now!
Quote from acekard official site
"AK2i update for 3DS2.1 and DSi1.4.3
This update support 3DS2.1 and DSi1.4.3. Please refer to readme file in the package.
Please choose update file according to your console. If you're using DSi or DSXL please use ak2ifw_update_3ds21_DSi143.nds to update. I f you're using DSL or DSPhat please useak2ifw_update_3ds21_DSi143_onDSL.nds to update.
Just follow the instructions after you run the update file."
Download address
Firmware Update of AK2i for 3DS2.1 and DSi1.4.3. Please refer to the readme file in the package.
Also in filetrip: Acekard 2i update for DSi V1.43
EDIT: Another update news by acekard
AKAIO 1.8.7 Fixed to 5750
Download here New Akaio 1.8.7
Quote from acekard official site
"AK2i update for 3DS2.1 and DSi1.4.3
This update support 3DS2.1 and DSi1.4.3. Please refer to readme file in the package.
Please choose update file according to your console. If you're using DSi or DSXL please use ak2ifw_update_3ds21_DSi143.nds to update. I f you're using DSL or DSPhat please useak2ifw_update_3ds21_DSi143_onDSL.nds to update.
Just follow the instructions after you run the update file."
Download address
Firmware Update of AK2i for 3DS2.1 and DSi1.4.3. Please refer to the readme file in the package.
Also in filetrip: Acekard 2i update for DSi V1.43
EDIT: Another update news by acekard
AKAIO 1.8.7 Fixed to 5750
Download here New Akaio 1.8.7