Hi everyone!

I have a Nokia 3500 Classic (RM-273) currently locked/branded to FIDO.
I would like to UNBRAND it.

Searching in NAVIFIRM, I found the following firmware :
RM-273 AMER-N, Latin, grey (0549613)

Will it work on my phone? (F/W version 7.21)

Also, from who should I buy the unlock code for the phone? I want to use it as a spare for my phone (Rogers) et my Girlfriend's phone (FIDO).

Thanks in advance for your help!