My previous firmware is HL8549 (GENERIC) - vRHL85xx.5.5.24.3.201801302301.x6250_1. And I upgrade to HL8549 (GENERIC) - vRHL85xx.5.5.24.3.201801302301.x6250_1 firmware again via One-Click tool then after it did not work correctly. It can’t access network and IMEI returned 004999010640000 and Seri Number didn’t return when I type AT+KGSN=3. Please help me fix it. Thanks
at+cgsn
13:53:05.607 on 26-Jul-2019>
13:53:05.623 on 26-Jul-2019> 004999010640000
13:53:05.623 on 26-Jul-2019>
13:53:05.623 on 26-Jul-2019> OK
13:53:05.623 on 26-Jul-2019> at+KGSN=3
13:54:51.35 on 26-Jul-2019>
13:54:51.35 on 26-Jul-2019> +KGSN:
13:54:51.35 on 26-Jul-2019>
13:54:51.36 on 26-Jul-2019> OK