Help! I need to know the default firmware for my phone. - Xperia SP Q&A, Help & Troubleshooting

I have sony xperia sp c5306, i bought it with virgin mobile canada, i'm currently on android 4.3 firmware 12.1.a.1.207 and I wish to downgrade back to 4.1.2 which firmware should i download?
Thanks!

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Greetings
hi
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