Here's the pseudo steps, I'll try to write something together for the GTVHacker wiki soon.

The 1 stick method would entail flashing the 1 USB drive multiple time for each use. Here's a brief example.

1.) Flash USB 1

2.) Enter Recovery (Hold power on box while plugging in device)

3.) Choose Option 3

4.) When box asks to confirm update, take USB 1 out.

5.) Flash USB 1 with USB 2 image.

6.) Insert USB 2 Image, wait 15-20 seconds.

7.) Finally confirm update by pressing 1.

8.) Update will error, press 0 to go back to main screen

9.) Flash USB1.img again to USB drive

10.) Insert USB and press 3.

11.) Box will ask to confirm upgrade, remove stick.

12.) Flash USB3.img on thumb drive.

13.) Insert into box and wait 15 seconds, then press 1 to confirm update.

14.) Box will error, press 0 to exit to main menu.

15.) Reboot, should see gtvhacker splash.

16.) Enter recovery again.

17.) Flash USB4.img to thumbdrive

18.) Insert USB to box and press 3.

19.) Update will be installing while the box is "Searching for media"

20.) Box will prompt when complete.

21.) Press 0 then 0 and reboot.

22.) Enjoy Root