Download the official stock ROM/Firmware for LG Optimus REGARD (LG LW770) revision “LW77010e”.
Here is the latest official stock firmware / rom LG Optimus REGARD (LG LW770) You can download straight from LG Support Website.
LW77010e_07.S10e_07.P45710.cab
You need to convert it to a kdz file, so that you can use the KDZ_FW_UPD tools software to manually update your smart phone.
Enjoy.