Today I installed 10240 build in my lumia 640xl lte dual sim. RM-1067. Installed the build without unlocking the bootloader. Flash the rom on windows phone 10 final build. with the help of wp internals. Installed whatsapp different versions. None of them worked for me. Only one got worked till otp. After that it is not opening... Exiting. Gb whatsapp and yo whatsapp not working. Tested only two or three versions. After some time developer menu not opening. So only one chance to install apk files through apk deployment tool. There is a glance screen but no option to turned it off. It remains always on. Everything working fine. But windows update getting download. I think 1475 version or like that. Store not working. Will post more.