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Many "firmware flasher" downloads are corrupted or designed for the wrong modem version (e.g., a firmware for a Hub running on Qualcomm chipset flashed onto a HiSilicon chipset). If the power flickers or the USB cable disconnects during the 4-second flash window, your GSM Multi-Hub becomes a plastic paperweight—unbootable and unrecoverable. : Briefly explain 2G/3G/LTE standards and how they
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