The BLU Win HD LTE (X150E) phone has started receiving the Windows 10 Mobile update in India. Unfortunately, nothing else - including detailed change log - is currently available as the information is based on user reports. Aside from the Win HD LTE (X150E), other BLU handsets that are confirmed to get the update include Win HD W510u, Win HD LTE X150q, and Win Jr LTE X130e. And as you might already know, the Win Jr as well as the Win Jr LTE X130q will not receive the update. Via
Source: http://www.gsmarena.com/blu_win_hd_lte_x150e_windows_10_mobile_update_now_rolling_out_in_india-news-18907.php