As you know, xiaomi has released a new version of redmi note 3 pro for taiwan market, and it support the 4g band 20 ( 800mhz ), i got the idea to flash only modem, and test if i can get the band. And it's work !I'm on MIUI V8 6.6.30 EU ( android 5.1.1 ) and i get the modem file from miui_HMNote3GlobalPro_V7.3.9.0 the special edition ported by AndersonAragao :But i guess that will work with original special edition modem.Download ROMExtract it and get NON-HLOS.bin file from firmware-update folderFlash it with fastboot ( unlock bootloader requirt ) : fastboot flash modem NON-HLOS.bin, and Voila !Before flash modem Phone cant detect 800mhz antennaAfter Flash : he can detect itinformation confirming the antenna typeIf you want to download modem onlyI'm not 100% sure that the trick work ! So test it if you want (can) and leave a feedback.obviously we can lose Calling after flashing modem, so thanks MadVegetable for his feedbackget Root,then go to /system fix "build.prop" as this:changero.qc.sdk.audio.fluencetype=fluencetoro.qc.sdk.audio.fluencetype=none