i can not install Windows via BootCamp on MacBook (Retina, 12-inch, Early 2015)

Did you have any update?

I has extracly same issue with Retina Macbook Early 2016. After run BCA, the Mac is reboot, showing the Windows icon and the all black - no matter how long I wait for its.

I just did a full Internet Recovery last night. I will try to post detail here and I hope its can work.

This is the video, its have same result. I try with other USB, other USB-C Adapter. Its always show the Windows icon but not the loading cycle and the screen just go black.

I'm verify the USB is working on other MAC model too.

Bootcamp install on Retina Macbook Early 2016 - YouTube

So, I have reinstall the Macbook using Internet Recovery (Shift + Option + Command + R) and Erase the Disk before install.

Its completed install EL Capitan 10.11.6 (15G31):

The output of diskutil list is:

diskutil list
/dev/disk0 (internal):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                         251.0 GB   disk0
   1:                        EFI EFI                     314.6 MB   disk0s1
   2:          Apple_CoreStorage Macintosh HD            250.0 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
/dev/disk1 (internal, virtual):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           +249.7 GB   disk1
                                 Logical Volume on disk0s2
                                 3D814A69-BC26-45F2-BDC9-78A60529C19B
                                 Unencrypted

And the output of diskutil cs list is:

diskutil cs list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group BA0A5204-3D07-4067-BF5E-1D90968D83D9
    =========================================================
    Name:         Macintosh HD
    Status:       Online
    Size:         250035572736 B (250.0 GB)
    Free Space:   18878464 B (18.9 MB)
    |
    +-< Physical Volume 9C948E48-BBC8-47DE-8C88-65D7F32E9F70
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk0s2
    |   Status:   Online
    |   Size:     250035572736 B (250.0 GB)
    |
    +-> Logical Volume Family BB972C35-39D9-48BA-9624-B48A680A5AFD
        ----------------------------------------------------------
        Encryption Type:         None
        |
        +-> Logical Volume 3D814A69-BC26-45F2-BDC9-78A60529C19B
            ---------------------------------------------------
            Disk:                  disk1
            Status:                Online
            Size (Total):          249664372736 B (249.7 GB)
            Revertible:            Yes (no decryption required)
            LV Name:               Macintosh HD
            Volume Name:           Macintosh HD
            Content Hint:          Apple_HFS

I'm using the latest Windows 64 ISO download from Microsoft:

openssl sha1 Win10_1709_English_x64.iso
SHA1(Win10_1709_English_x64.iso)= 1ad928cfef439f6aa4044ddc3a96b0b6830bdd0f

I'm reset SMC (How to reset the System Management Controller (SMC) on your Mac - Apple Support) + NVRAM(How to reset NVRAM on your Mac - Apple Support) before login to OSX and launch the BCA.

Since this is EL Capitan, Its required a USB. So I attached USB and begin the process.

If you still have the USB2 flash drive created by the BCA, can you check Bootcamp.xml for Product Version?

W10 would need the 6.x drivers, while W8/8.1 can use either 5.x or 6.x drivers. Your black screen issue is related to a GPU driver.

Disconnect all external storage, and run the following two procedures

Resetting the System Management Controller (SMC) on your Mac - Apple Support

How to Reset NVRAM on your Mac - Apple Support

Do not use any USB hubs, just the USB-c to USB adapter needs to be used.

Was an SMC/NVRAM reset executed while external devices were connected to the Mac? Can you post a Finder screen shot of the USB? Did BCA format the USB drive?

Can you post a directory listing of the USB with one level expanded? It should have a $WinPEDriver$, Bootcamp, AutoUnattend.xml and the Windows Installer files.

Use the USB-c-to-USB adapter, connect the adapter to the Mac with the USB, reboot your Mac and hold Alt/Option key. Do you see any selections from the USB flash drive? You may want to reset SMC/NVRAM before you run this test.

Can you expand $WinPEDriver$ and list what directories you have?