PC sends: 55 55 (AT command prefix) Modem replies: 4F 4B (OK in hex)
Here’s a helpful review you can use or adapt for a situation where the Meta USB COM port isn’t being recognized for modem handshake: it cannot find the meta usb com port for modem handshake
Before diving into complex driver installations, rule out physical issues. PC sends: 55 55 (AT command prefix) Modem
Some meta tools require you to manually enter the COM port number. If the number has changed (e.g., from COM4 to COM7), the software cannot find it. from COM4 to COM7)
Use a high-quality data-sync cable. Cheap "charging-only" cables will not trigger the handshake.
The handshake often fails because the timing or button combination is incorrect.
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