One of our readers said that he used the LG bridge to bring back from a soft bricked G Stylo H631 Model;
LG Bridge does not support Sprint and AT & T Phones that Support Firmware Update via FOTA only. So You cannot use LG Bridge to upgrade or recover the LS775 model.
Please notes that the LG bridge’s Update error recovery option does not solve all soft brick issues. There is no risk to try the LG Bridge to unbrick your G stylo (H631 & MS631) phone.
Using LG UP from LG to flash stock firmware is the best way to bring your G Stylo back to Stock. Follow this guide to unbrick Your LG G Stylo /