sim800l can't connect??

[MahmoudMohamedAli]

i use sim800l with stm32f103c8 and sim can't connect to cellular network there is error in
if (gsm_command("AT+SAPBR=1,1\r\n", 90000, NULL, 0, 2, "\r\nOK\r\n", "\r\nERROR\r\n") != 1)
so pls can u help me.

[nimaltd]

do it step by step

gsm_init();
gsm_power(true);
gsm_waitForRegister(30);
gsm_gprs_setApName("your ap name");
gsm_gprs_connect();

[MahmoudMohamedAli]

i fellow your instruction step by step!! should i update the firmware??of my sim800l

[nimaltd]

no. it does not need