This is the most skipped step—and the most dangerous. The term is not specific enough. There are at least three different hardware revisions of the Vida M4 (v1.0, v2.1, and v3.0). Flashing the wrong firmware will brick your device, turning it into an expensive paperweight.
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Vida M4 LTE Router (often branded as the Airtel Vida M4 ) is a popular portable 4G MiFi device manufactured by Vida Technologies Limited vida m4 lte router firmware download