Hello, i am a deaf spanish guy and buy a Mi4. And its a great and nice Movile. Now i am ussing: xiaomi.eu_multi_cancro_5.8.6_v6-4.4 The problem result the vibratión of Mi4 have a intensity more low and this dont help to deaf people. I like know if you guys know a solution to increase the intensity of the vibration in Mi4 or what rom is the best to it. Or if no have option, one solution to improve the whatsapp vibration if receibe messages. Tank you all for the help.