We are doing a phone, which using a HL8548 (without “G”) module
I have bought HL8548 module from a lot or supplier. But this time, I have tried with a Chinese supplier
Now I have on hand 110pcs module with nice looking(there is no FCC ID on the marking, pls check below link for the module looking https://photos.app.goo.gl/m1twAL34taDPkwBRA ) but not working well
They can be turned on ( I check the V_GPIO=1V8 after power up), but there is no way to communicate with the modules
It doesn’t send out any thing via UART pins (5 and 6 pin).
Normally there will be
" +SIM: 1
But with these module ( I have tested one), it doesn’t sent out any thing. And when I send AT /r/n, there isn’t any “OK”
I am thinking of upgrading firmware for those modules.
Can you guys show me how to do this, or anything to make these module talk to me via UART
Thanks for reading
P/s: I have changed the baudrate form 9600 to 115200, but it didn’t work