Do you like you the LG V10's hardware but wish you can install a different ROM on it? The first step to that is by unlocking your phone's bootloader. In LG phones, this has been notoriously difficult because the company locks its bootloaders and workarounds are either non-existent or super complicated.
What LG has been offering though, in the past year, is an official page to help you unlock the bootloader on the European G4 and G5, and now it's adding the LG V10 for Europe. But only on Marshmallow — this doesn't work if you're still on Lollipop. Oh and there's a clear exception for France, because as far as I can tell the phone wasn't officially released in the country.
LG is quick to point out the dangers of unlocking the bootloader and the fact that it'll void your warranty, but if you couldn't care less about that and you know what you're getting into, the page has detailed step-by-step instructions that'll take you through the process.