For updating the firmware through the USB lines of SIM800 we need to connect the USB data lines (USB_DN, USB_DP) and USB power line (USB_VBUS) to a PC or laptop using a USB connector.

Download : AiThinker_Serial_Tool https://drive.google.com/file/d/11y3OMHtx5XZe89-4MrajNLtV40MEEQDm/view?usp=sharing

Download : Firmware Version https://drive.google.com/file/d/1uTiVgg7fb6hTMGXCtn1l9gs3wewDVAsB/view?usp=sharing

Download : Firmware Flash Tool https://drive.google.com/file/d/1PtPLzHDPYmqGUk5cn7OaKRZJz2rvddcM/view?usp=sharing

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Firmware

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