I have locked my phone with:
wehrli@wehrli-hpprobook455g4:/media/wehrli/Mes fichiers/Documents/informatique/telephone/fairphone 4/IMG-e-2.9-a14-20250321478214-official-FP4$ fastboot flashing lock_critical
OKAY [ 0.026s]
Finished. Total time: 0.027s
wehrli@wehrli-hpprobook455g4:/media/wehrli/Mes fichiers/Documents/informatique/telephone/fairphone 4/IMG-e-2.9-a14-20250321478214-official-FP4$ fastboot flashing lock
OKAY [ 0.027s]
Finished. Total time: 0.027s
wehrli@wehrli-hpprobook455g4:/media/wehrli/Mes fichiers/Documents/informatique/telephone/fairphone 4/IMG-e-2.9-a14-20250321478214-official-FP4$
But my phone don’t start on /e/os only on bootloader.