One of our readers said that he used LG bridge to bring back from a soft bricked G Stylo H631 Model;
By checking this URL, We can not find the G Stylo LS775 model. So we can not use LG Bridge to upgrade recover the LS770 model. LG Bridge does not support Sprint and AT & T Phones that Support Firmware Update via FOTA only.
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 /