Hello, Thank you for your support. For the current manufactured PCBA, I tried to upload AT firmware to the modules. It's not programming at all. I am in big trouble with the big order contract. I need your kind advice to solve the programming issue. Meanwhile, I found a programmer which I am assumin...

Hi, Thank you for the reply, I need 1k-2K pcs. minimum every month, At command firmware downloaded. Thank you

Thank you very much for your prompt reply. I have already assembled PCBA, I thought that those modules came with firmware like GSM modules. As seen in the picture the module already soldered, about 25 prototypes. had on a production 1500 PCBA, I suspended the production now. How can I download firmw...

Hi, Please see the attached schematic of ESP32-C3-MINI-1 circuit. Power on state keeps the EN pin at the "0" state for about 30 seconds until the MCU ends some functions then the EN pin goes to the "1" state. MCU Sending AT command, but no reply. I have the endless loop of printouts as below. The ES...