Yoga Book Yoga Book is a tablet manufactured by Lenovo. Latest user agents:Dalvik/2.1.0 (Linux; U; Android 6.0.1; Lenovo YB1-X90L Build/MMB29M)Dalvik/2.1.0 (Linux; U; Android 6.0.1; Lenovo YB1-X90F Build/MMB29M)Dalvik/2.1.0 (Linux; U; Android 7.1.1; Lenovo YB1-X90F Build/NMF26X)