Qualcomm signs each Firehose loader with a per-device or per-SKU private key. Nokia 1.4 units typically enforce that only an authorized Firehose (matching the device’s OEM hash) can run. However, leaked or engineering Firehose loaders bypass this.
The Firehose loader serves critical functions: Nokia 1.4 Firehose Loader
If your Firehose loader works on an Android 10 device, it will work on Android 11 and 12. However, be aware that Anti-Rollback (ARB) may be enabled in newer updates. Do not flash an older firmware version than what was previously installed, or you might permanently fuse the chip into a hard brick that even Firehose cannot fix. Qualcomm signs each Firehose loader with a per-device