OnePlus One not enter into fastboot or rom, enter only recovery mode

Today morning I installed oxygen via fastboot with this tutorial : h t t p s : / / f o r u m s . o n e p l u s . n e t / t h r e a d s / o x y g e n o s - 2 - 1 - 4 - f o r - t h e - o n e p l u s - o n e . 4 2 5 5 4 4 /

then I wanted to get into fastboot to going back to Cyanogenmod 13 .
But the surprise is that they can not access fastboot.


This is a video found on youtube !

This is precisely what I tried myself, but nothing .

h t t p s : / / w w w . y o u t u b e . c o m / w a t c h ? v = y L d 6 T C M N O Q E & a b _ c h a n n e l = j o s e p h f r a n c o

Please Help me!

Sorry for my bad english, i used google translate!