Typing this secret code *#06#. You can check your IMEI number. Enter *#*#4636#*#* to see testing menu. From that menu you can select options which helps you find specification your REDMI Note 9s or Wi-Fi information. Phone Information 1 and Phone Information 2 - Here you can find your IMEI number, signal strength, cell info and connection type.
Now press “Audio”, and choose either Loudspeaker Mode or Headset Mode, depending on which you want to change. On the drop-down menu for “Level”, choose Level 6 – or whatever is the highest level for the option you select. Now at the bottom of the new menu, you’ll see two fields where you can input new values. “Value is 0~255
More info about codes in XIAOMI Redmi Note 9 Pro:
However, the tech menu is still necessary for some users and all phone manufacturers offer free access to it, with the possible exception of Apple's shopping mode. However, you need to know special USSD codes that can be used to open engineering mode in the Xiaomi Redmi 9. Xiaomi Redmi 9 special codes and where they can be obtained
In other mediatek powered devices like realme 6 and redmi devices MTK engineering mode workes fine but not in realme 7 and narzo 20 pro. You can enter it by typing *#*#3646633#*#* in native dialler. This might be problem because realme introduced Google dialer insted of its conventional dialler. However, the tech menu is still necessary for some users and all phone manufacturers offer free access to it, with the possible exception of Apple's shopping mode. However, you need to know special USSD codes that can be used to open engineering mode in the Xiaomi Redmi 10C. Xiaomi Redmi 10C special codes and where they can be obtained
I have used Engineering mode in increase the audio output on my LEAGOO M8 Pro, and it works for everything except in call volume (listening to the voice of the other person talking). Media playing, ring volume, and other sounds are now loud, but the in call volume is so low I cannot hear the other person talking.
ywt6.
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    • engineering mode code for redmi