here is method of L661 unlocking from CDMA-TOOL
1.First select L661
2.Select modem port and click diag enable.
3.Click read info to check if diag enable is ok.
4.Select diagnostic port and then click write efs.
5.Just write EFS only from below file
6.Your handset is unlock.
here is link of flash file
no need flash, then input unlock code.
no need to buy any other tool!!
here is link of flash file
Download nor.rar from - send big files the easy way
all version will be unlocked via this method no need of downgread and other method