h3 4x4

So yesterday I bought a 2009H3 alpha and noticed it was in 4hi. I tried to switch it out of four high by holding the two outermost buttons to get it to go to 2wd. Long story short after I did that. It didn't budge an inch when put in reverse or drive is the H3 alpha a full-time 4x4? Or is there...

2007 HUMMER H3 w/ only 76,200 miles in EXCELLENT condition. Luxury package, tan leather, driver and passenger power / heated seats, black grill guard, black side steps, tow package, GOBI roof rack and rear ladder, Hercules Trail Digger tires (285/75/r16) + rear door mounted spare. 3.7L...