The only way to unlock the T-Mobile branded/sim-locked Idol 4s for use on other networks is to unlock it through T-Mobile. Or if you are lucky you might get Alcatel to do it. That is the only way I have successfully unlocked that variant. Flashing other Firmware or other ROMs won't help.
Added BDS Menu.
Added ADC-files from IDOL4S PRO (6077X).
Added packages acer.Service.AcerSystemService, Nokia.Executable_OEMServiceHost.Generic, Nokia.Service_NdtkSvc.Generic.
Added packages MS_TSHELL.MSN.MainOS (bcdedit, cmd, reg and other).
Some other tweaks and other minor changes.
Install Qualcomm drivers on your PC.
Install QFIL (QPST) on your PC.
Install custom ROM on your device in the mode 9008/EDL using QFIL (QPST).