Fairphone 4 is not booting in the last step

[msp]

@ltnrkns

is not working in my terminal.

Please post the complete output and error message.

[ltnrkns]

…:platform-tools …$ fastboot flashing lock_critical
-bash: fastboot: command not found
…:platform-tools …$

[aibd]

@ltnrkns

./fastboot devices
55146dce fastboot

…

[msp]

https://www.baeldung.com/linux/execute-file-using-dot-slash

[ltnrkns]

Update…
Thanks for your help!
I installed 2.7-U on my FP4 and have no problems by now.