idk if it will work
but I have a copy of the OTA for the xt926 from Verizon us idk if you can use it to get the bootloader . I sideloaded the OTA from the soak test! I can upload it somewhere if needed
In droidrzr forums there is an Unofficial Omni Rom for kitkat bootloader..
btw, for xt925, dhacker says that we only need the new bootloader (maybe installing the leaked soak test from France we can use the newest roms)
but I have a copy of the OTA for the xt926 from Verizon us idk if you can use it to get the bootloader . I sideloaded the OTA from the soak test! I can upload it somewhere if needed