It is often a "green" or portable executable, requiring no heavy installation.
For the aspiring technician: learn QFIL, collect loaders from official firmware, and practice on a donor device. Once you master QFL v10, no Qualcomm device is truly dead – only waiting for the right Firehose.
QFL v1.0 is often command-line driven. A common usage pattern:
Before using QFL v10, make sure to: