Just wondering WHERE you read that downgrading the software would unlock it.
The only way to unlock a BlackBerry is with the correct code, which is only available from a carrier (not Fido) or from a commercial unlocker. I would contact the commercial unlockers and find the least expensive one that will work for you.
Second - you can not use your BB on Fido for anything except voice and SMS text. Fido does not recognize the BlackBerry. No Internet; no data. Voice and SMS only.
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