I used White Out to fill the gaps and defogger repair paint from Autozone to unlock my 1600+ and have it running at 11.5x138=1587mhz@1.8 volts
Make sure that the paint does not get anywhere it should not be i.e the little arrow near the L1 bridges or the numbers marked on the chip because that will ground it out and it won't work. In my case it automatically defaulted to a 1700+ but I could no change the multiplier any higher. If the paint gets anywhere it sould not be use nail polish remover and a q-tip to remove it.