HC12 Wireless Transceiver mdules will not configure

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 >:(  have 3 brand new hc12 modules not configure ... nor can read present configuration shipped.  quality of these modules bad many of them defective?  alone or have others received hc12 modules unresponsive upon arrival?
 are there hacks/jolts/fixes can revive dead hc12?
 any assistance appreciated.

how trying configure them?
the modules default 9600, , @ commands have sent @ full speed no gaps between characters, typing commands them wont work.


Arduino Forum > Using Arduino > Networking, Protocols, and Devices (Moderator: fabioc84) > HC12 Wireless Transceiver mdules will not configure


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