This will allow EZ5i to work wih DSi v1.4.3.

DON'T RENAME THE FILE BEFORE YOU UPDATE THE FIRMWARE
THE FIRMWARE UPDATE FILE MUST BE PLACED ON THE ROOT OF MICROSD

V106 firmware update will wipe out and reprogram the whole bootloader, it needs the EZ5Fm106.nds keeping original file name to be the reprogram data source.
rename the file will cause reprogram process fail and your flashcard bricked.

http://filetrip.net/...update-106.html