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