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Hi everyone!
I bought SIM900A https://www.aliexpress.com/item/SIM900A-GSM-GPRS-mobile-development-board-with-voice-interface-antenna/1618287088.html.
It is not been possible to register on the network (locked I guess).
I uploaded firmware "1137B11SIM900A32_ST.cla", and it will not power up...
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