For example, in North America, the GSM frequency operates between the 850 and 1900 MHz bands, while in Europe the 900 and 1800 MHz bands are used. This causes us not to know if our device can work wherever we go, causing us true headaches. However, in many cases this limitation is implemented through software, so it can be easily eliminated. If you use a device with Qualcomm processor With these limitations, thanks to XDA you can use it anywhere in the world. The entire process is carefully described in a 36-step guide and after following them, our Android phone should work anywhere in the world without problems.
To perform this method we must have several things in mind. The first thing that should be used in a rooted terminal and with a terminal emulator installed. And second, what is a risky process and that it can leave the phone useless, so we are not responsible for any damage that may be caused by poor execution of the tutorial. As always, we recommend you make a backup of your data since, as we are going to work with the “radio”, we can cause the brick from the Android terminal. After these tips, we are going to show the steps for the advanced level tutorial:
- Download this zip http://dh.st/0Me
- Extract and install QPST from zip
- Open the calling application and dial * # * # 8778 # * # * (it should automatically exit the application after the last asterisk is marked)
- Connect your Android to the computer.
- Open the ADB console.
- Enter the following commands:
setprop persist.usb.eng 1
- Turn off USB debugging and disconnect your phone from your computer.
- Wait a few seconds and re-enable USB debugging on Android.
- Reconnect the computer to the computer, at which point it should try to install some drivers. Wait until the installation of these fails.
- Open the device manager and you will see your device model multiple times. Go to the “Details” option, scroll down and you will see a “category” MI_0x.
- Browse through those devices until you find MI_04.
- Select “Update driver” and install the HTC driver from the zip that we downloaded earlier.
- Press Start and navigate to QPST -> QPST Confguration.
- Go back to the device manager and look for Modems -> HTC.
- Find the “COM *” port (it can be COM1, COM2, COM3 …, it depends on your computer).
- In the QPST configuration, click on “Add new port”, setting the port from the previous step. In label (label) write the name you want, like the model of your smartphone.
- Navigate to QPST / bin and open RV_NV_Manager.exe
- Click on Setting -> Comport and choose your COM port.
- Select File -> Read from put.
- Please wait patiently for the process to finish and pay attention!
- Go to line 1877 and copy the decimal number from the right side into any word processor.
- Go to the place where you extracted the zip in the first step and run mzTool.
- On the left side you will see “Input radix”, where we will have to put the previous decimal number.
- On the right side you will see “RF BC CONFIG”, where we will have to paste the number copied earlier in RV_NV_Manager.exe
- Now you will be able to see the bands that the phone is capable of using, specifically in “Bit information”.
- Change to the “Band preference (NV Value)” tab.
- Select all available GSM and WCDMA bands. In the event that you know how they work, select those that interest you.
- After this, copy the decimal number from the lower right side.
- Remove all commas from the number (“,”) to make a single number.
- Open RV_NV_Manager.exe from where we left it (step 23) and paste the new number without commas.
- Select write NV and then go to File -> Write changed NV to the put
- Open the terminal emulator on your Android and type the following:
setprop persist.usb.eng 0
- Restart the device.
- Type, as in the first steps, * # * # 7378423 # * # *, to see all the bands you can use.
As you can see, it is a somewhat complicated but very mechanical tutorial that will allow us to release all the frequencies of our SoC so that we can call from anywhere in the world. We hope it has been helpful and, as always, we recommend you visit our dedicated section.
Via XDA Developers