What is baseband?

If you have rooted your phone and flashed custom ROMs you must have overcome the term baseband several times. Many times people confuse between kernel and baseband. In Android Kernel is the most important piece of software that controls almost every aspect of the device. The kernel has all the drivers for everything else, including camera, Bluetooth, and Wi-Fi, built into it. The baseband is merely a piece of firmware (a type of software), that controls the radio in your phone. The baseband is responsible for the network connectivity and other connectivity options.

baseband 85 ST18i

Recently the latest baseband version “8x55A-AAABQOAZM-203028G-85” for Xperia Ray(ST18i) is leaked on the internet. This baseband provides better network stability and lesser battery drain as compared to the older 77 baseband. Here is a simple tutorial to flash the latest baseband on your Xperia Ray.



  1. Make a full Nandroid backup of your system before continuing any further.
  2. Now install Flashtools on your PC.
  3. Now open Flashtools and select the lightening button on the top left corner.
  4. Select Flash mode and press OK.
  5. In “select source folder” navigate to the folder where the baseband file is placed.
  6. Now the window will look like this:baseband 85
  7. Make sure that the options are selected just as shown in the image.
  8. Now power down the device.
  9. connect the USB to the PC.
  10. Now press and hold the volume down key as you connect the USB to your phone. 
  11. The green led will light up indicating that the device is connected in Fashmode.
  12. Now press OK in Flashtools.
  13. Once the flashing process is complete reboot your device.
  14. Enter recovery mode and restore your phone using the recently created Nandroid backup.
  15. Once the phone boots up successfully you will have the 85 baseband flashed successfully.

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One Comment

  1. retset
    Posted November 1, 2013 at 9:14 am | Permalink

    Why do I have to restore the Nandroid Backup in step 14? Wouldn’t this revert the phone back to its previous baseband version?

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