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In Samsung firmware nomenclature, these characters are critical for compatibility:

Ensure your Google Account is removed or "OEM Unlock" is on, or the phone will block the custom file. The Baseband version If you have access to a Windows PC for the flash tools In Samsung firmware nomenclature

If the "U" version of the file doesn't match your device (e.g., trying to use U1 on a U2 device), the phone will fail to boot. In Samsung firmware nomenclature

This represents the Binary/SW Rev. version. Samsung prevents "downgrading" to a lower binary. You must use files specifically labeled U2 or higher. In Samsung firmware nomenclature