Please can anybody show me how to flash ZTE Z970_MetroPCSV1.0.0B06 or Z970_MetroPCSV1.0.0B12 modem firmware into Z970_MetroPCSV1.0.0B13 or flash the entire Z970_MetroPCSV1.0.0B13 version with Z970_MetroPCSV1.0.0B06 or Z970_MetroPCSV1.0.0B12 firmware Steps. Root with kingRoot online. Not a normal root, the "strategy available" Then install a TWRP.apk Install the recovery an reboot in TWRP recovery mode an install supersu.zip from the recovery. Now you have permanent root. then Downgrade modem from the recovery For MetroPCS you can downgrade to B6 to unlock and upgrade to work fine to B12 For T-mobile you can downgrade to B22 to unlock and upgrade to work fine to B33 TWRP https://www.mediafire.com/?smsymhdzvp6qj55 B06 Modem for MetroPCS https://www.androidfilehost.com/?fid=24269982086991464 B22 Modem for T-mobile https://www.androidfilehost.com/?fid=24269982086991623 B13 Modem Firmware for MetroPCS variant https://www.androidfilehost.com/?fid=24269982086991465 B33 Modem Firmware for T-Mobile Variant https://www.androidfilehost.com/?fid=24269982086991624 SuperSU https://download.chainfire.eu/696/Su...etrieve_file=1 Don't change the packages or you will brick your phone. This packages are not a full flashes, only modems. This is under your own risk, I'm not responsable if you brick your phone. This solution is not mine. I just funded. This is only for downgrade from B13 to B6 and B33 to B22. Not for oder version. Please be carefull I hope this can help you. LINK VIP DOWNLOAD FREE Please log in to view this content !