First step for Installing Rom 

1. Download and install QPST 2.7.422 with QFIL
2. Download and install Qualcomm USB Drivers.

How To Flash ROM Alcatel Idol 4 6055K

1. Run QFIL.
2. In any other case u have to install drivers manually.
3. Qualcomm HS-USB QDLoader 9008 (COMXX)
4. There should be device called in device management:
5. Turn off the phone. Hold Vol+ button and plug-in USB Cable. Phone will vibrate one time, screen wil be black. This is DownloadMode.
6. Download and install QPST 2.7.422 with QFIL and Qualcomm USB Drivers.
7. Click Browse� in Programmer Path and choose prog_emmc_firehose_8916.mbn
8. Load XML in Download Section:
9. First select RawProgram File: rawprogram0.xml
10. then Select Patch File: patch0.xml
11. Check all inputs is correct and click Download under Load XML button and wait about 5 to 10 minutes:
12. After flashing process starts and might take up to 5-10 minutes. So keep patience and wait
13. See detailed Instruction Qualcomm flashing  QPST tool with images