Try to apply the 1500 strap to 2100MHz
and where do you do that ? never have see 2100
Change the strap, make 2000 into 2100.
Click on the 2000MHz strap, it will then appear close to "APPLY CHG" with the current values.
1st line the frequency: 2000.
2nd line the strap: 777000000...................
Replace 2000 by 2100, then click on "APPLY CHG". You'll see the new strap at 2100MHz. Once you're done with the other mods, save your bios and rename it in a conveniant way.
Then flash.