Hello Windows Central!
Great news! Windows 10 mobile upgrade is finally available to Blu WIN HD LTE x150e.
Here are the steps..
1) Install Windows Device Recovery Tool onto your pc or laptop.
2) After Launching the tool select My device Was not detected.
3) Then select the manufacturer BLU. Select the Model BLU WIN HD LTE.
4)Click on Install Software where it will ask to download latest win 8.1 recovery image which contains new firmware.
Download complete BLU_WIN_HD_LTE_x150q_00150.04717.20001.15013_RETAIL_FLASH_20160226_00150.04717.20001.15013.ffu image.
5)Now turn off the phone. Press the power button and immediately after vibrating press and hold volume up button till you will see flashing icon and spinning wheel (flashing mode)
6)Now connect your phone to the pc via usb cable in the flashing mode.
7)Launch the App and select Manufacturer BLU-Model-Blu win HD LTE.
Click on Install software. This time you will see the battery icon. Make sure that battery is almost 25% charged and follow the onscreen instructions.
Now flashing will begin and once completed the language screen will appear. This will change the firmware from 15009 to 15013.
8)Once done, go windows store and download Upgrade Advisor app and check the upgrade availability for your device and follow the prompt to install the latest build.
9)Finally go the settings and check for the updates. The update will be available.
On April 14,2016. Microsoft has release the new windows 10 mobile Build version 14295 codename Redstone. This should be available on Insider Fas ring using Windows Insider program.
Once you signed up and select the insider ring, it takes around 24 hours to get the upgrades, so be patient ...