1. Download ROM, the file must be a .rar, extract it with WinRAR, 7Zip or any other archive extractor. Now you'll get an IMG. Just rename the IMG to atvx so it now becomes atvx.img.
2. Download Amlogic Burn card maker
http://www81.zippyshare.com/v/ZoilYyaS/file.html
3. Get an EMPTY SD Card
4. INSERT THE MEMORY CARD INTO YOUR COMPUTER WITH A USB CARD READER.
4. OPEN THE TOOL AND SELECT THE IMG ROM FILE. NOW SELECT THE SD CARD DRIVE.
5. SELECT *FORMAT* OPTION, DESELECT ERASE BOOTLOADER. NOW, LEAVE OTHER SETTINGS AS IS.
NOW CLICK ON (MAKE)
6. IT WILL TELL YOU TO FORMAT MEMORY CARD. FORMAT MEMORY CARD WITH FAT FILESYSTEM AND USE QUICK FORMAT.
7. IT WILL NOW FLASH THE ROM IN MEMORY CARD.
8. INSERT MEMORY CARD IN BOX.
9. USE A MATCHSTICK AND PUT IT IN THE AV PORT HOLE OF THE ROM.
10. NOW PUSH THE MATCHSTICK INSIDE THE HOLE TO PRESS THE BUTTON. KEEP IT PRESSED AND TURN ON THE POWER.
11. WAIT FOR 5 MINUTES TO FLASH.
12. ALL DATA WILL BE WIPED.
13. ENJOY!