On May 4, U.K. unbranded LG G5H850 (suffix:GBR) model received its first V10C software Update since initial release V10a.
You can use LG Bridge to install the Software Update. When connect your phone to PC with USB Cable, run the LG Bridge from your PC.
The LG bridge should notify you that there is a new software update available. Follow the on-screen instructions, You can upgrade your LG G5 with H850V10C software Update.
Those who can not upgrade their LG G5 with LG Bridge can download the stock v10c KDZ firmware from below links:
Learn how to use LG UP to flash stock kdz firmware on LG G5, Check this Guide.