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A "Stock ROM" refers to the version of the operating system that comes pre-installed on your device when you buy it. Unlike Custom ROMs (which are developed by third-party enthusiasts), Stock ROMs are officially developed and signed by the manufacturer (Samsung, Xiaomi, Oppo, Vivo, etc.).

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Flashing firmware carries risks. To ensure your device survives the process, keep these tips in mind: rom4gsm.com