Sim900 GPRS SHIELD problem help me all?

Official Hardware Retired GSM Shield
1

AT command not response. Power key pressed always return char àÿÿÿÿÿÿÿÿ€€€€€€€€€€€€€€€€€€.
i use Arduino Uno R3
Linksprite Sim900 GPRS Shield external power is 5v 2.5A adapter
Help me!!!

2

Hi. Sometimes weird characters are caused by different baud rates.

3

I solved thx man

4

You're welcome!