Recover windows 8.1 on a lumia 640 dual sin DTV with windows 10 RRS feed

  • Question

  • a friend of mine has a lumia 640 xl dtv, he asked some guy to install windows 10(system info below), but its still buggy, so he wants to rollback it to 8.1, but im finding trouble trying to do it.

    tried with "windows phone recovery tool" it dnst regonize the phone.

    usb is not regonized by a windows 7 

    tried to use vol + power but nothing happens

    system info:

    firmware update notifier:

    Lumia First Use Experience

    Messaging+ agent

    Rate Us

    silent installer

    sim unlock

    ram 1gb

    manufacturer name rm-1109_1000

    mobile operator 000-br

    configuration id 1000.0247e9

    core build id 6230.54 (02177.00000.15184.36000)

    bsp release 2177.0000

    active customer configuration 16439

    master configuration label 15wk16_1

    preloaded content label 15wk17_1

    application version

    build creation date 22/05/2015

    made in brazil

    any suggestions on what i could do

    Thursday, October 29, 2015 2:06 AM