YOU HOLD MYSELF AND XDA FREE FROM ANY LIABILITY BY FLASHING THIS RADIO. DO SO AT YOUR OWN RISK. WE ACCEPT NO RESPONSIBILITY FOR WHAT YOU DO TO YOUR PHONE
IN ORDER TO ACCEPT ANY FUTURE UPDATES YOU WILL BE REQUIRED TO FLASH BACK THE STOCK RADIO FOR THAT VERSION. FAILURE TO DO SO MAY LEAD TO A BRICKED DEVICE WHEN ATTEMPTING TO UPDATE.
Pulled the new 4.4.4 21.11.21 Radio for the Droid Ultra, Maxx, and Mini from the FXZ for those of you who do not want to update but want the new radio. I have attached three files below, one containing the files for 4.4.4 21.11.21, one for 19.6.3 4.4 radio, one with the stock 19.5.3 4.4 radio. Download both.
1) Download the three radio files.
2) Unzip the 4.4.4 21.11.21 files into the same folder in which you have adb setup. In my case this is c:/sdk/platform-tools
3) Open a command prompt and navigate to that directory
4) run the command
adb reboot bootloader
5) run the commands below to flash the 4.4.4 21.11.21 modem
fastboot flash modem NON-HLOS.bin
fastboot erase modemst1
fastboot erase modemst2
fastboot flash fsg fsg.mbn
5) When the phone is rebooted navigate to phone info and verify the new baseband version.
6) To return to stock 4.4 19.5.3 radio or 19.6.3, simply remove the files you placed in platform-tools, and replace them with their 4.4 counter parts. Then repeat steps 1-5.
Donations are appreciated to TopSnake
4.4.4 21.11.21 Radio
4.4 19.6.3 Radio
Stock 4.4 19.5.3 Radio
Donations are appreciated!
Droid Maxx and Droid Ultra
Both Unlocked and Rooted