it depends how it is bricked, if the firm is the only problem then yeah that will fix it.
but if it is 'bricked' because you uninstalled a bunch of system titles that you need, then no - you will have to do some more stuff
Where would bricking by installing O3DS 9.2 FW files on an N3DS unwittingly land? Recoverable without a nand dump and hardmod, or nah? >.>. Still so embarrassing and all my fault.