Firmwares and locations

Lets say I live in the Philippines, and I want to flash the latest firmware for my phone BUT IT IS a RUSSIAN firmware. Is it OK and safe for me? Is my SIM Card gonna be affected? Or are there any other risks and downsides?

Another fast question, when the time comes that I will flash RUSSIAN FIRMWARE, is it gonna boot on Russian language by default? Can I change it?

Thanks.

Sent from my GT-S7500

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