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I would like to flash my Samsung S9 (SM-G960U - Universal model sold in the US) with a French firmware and no carrier tools. My S9 currently has a USA-firmware linked to AT&T.
Do I take a risk doing so, knowing that the US model has a Qualcomm processor and the European one has an Exynos? Some other hardwares are also different. Actually I hardly catch GSM and 3G/4G signals in France with my US-S9 and I wonder if using a "local" (french) firmware would improve? Thank you all.

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