Several specialized software solutions are used by technicians and DIY users to clear the FRP lock on the Itel A661L:
A free alternative used to flash the device's firmware, which can reset the FRP lock if a compatible "PAC" flash file is used. itel a661l frp bypass unlock tool
If you do not have access to a PC, there are manual bypass methods that exploit accessibility features. These do not require a traditional "tool" but rather specific actions on the screen. itel a661l frp bypass unlock tool