@hamgammon Search here for get unlock ability for the exact command and more details, however as long as you respect the SPL as described above (same or newer) it should be safe.
And a FP3 might be survived without FPs help
With a bit of luck and community support, you might even get to do this yourself
If you end up in a situation, where your FP3 cannot get into fastboot on either slot, there is now an unbricking solution available using EDL/QDL mode.
In this situation the phone will usually already be in EDL mode (lsusb output):
Bus 001 Device 009: ID 05c6:9008 Qualcomm, Inc. Gobi Wireless Modem (QDL mode)
You can however force EDL mode by holding both volume-buttons during power on.
If your device comes up as:
Bus 001 Device 009: ID 05c6:900e Qualcomm, Inc.
Make sure you cannot enter F…
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