A note of caution here as qUnlock S1 Unlock tool will change bootloader unlock allowed to YES provided that device has provider SIM lock in place; that free network unlock may mean that you can’t subsequently change "Bootloader unlock allowed = No to YES
Here is an example where software couldn’t work upon SIM unlocked device:
https://forum.sailfishos.org/t/unlock-bootloader-xperia-xa2/9952?u=aspergerguy