I have seen more of the same article on different websites, but that is about the image I made before this one, where indeed only the values 1000, 1200, 1280, 1300 and 1400 were accepted.

In this version the values 1000, 1080, 1200, 1220, 1240, 1260, 1280, 1300, 1320, 1340, 1360, 1380 and 1400 are accepted.
However, this time it does not work to simply change the index.php file, you need the entire image: https://mega.co.nz/#!GNMQAIrb!IjkpJvS36O29AfOKc_jR9aezdH5yZnHMiGY5mIGyypk