[Q] cant switch build version topic

ok so im building ZTE open C firefox os and i can easily get a working build of 2.2 FxOS but when ever i try to BRANCH=v1.4 ./config.sh openc.xml and BRANCH=v1.4 ./build.sh gecko it builds and finishes but doesnt end up with v1.4 it still ends up on 2.2

any idea on how to fix this is welcome please