Elitebook w8570w boot from USB-Stick

[Do-AA]

I've created with Rufus an Linux-Mint-Installation-USB-Stick.

I've done "Standardeinstellungen wiederherstellen" (restore default settings) and

"BIOS-Sicherhiet auf Werkseinstellungen zurücksetzen" (Reset BIOS security to factory settings).

Boot-Modus is set to "Betriebsystemunabhängig" (Operating system independent).

When I  select ESC and F9 after Power On, I get only

- Notebook Upgrade Bay

- Notebook Harddrive

- Notebook Ethernet

as booting options!

What have I do to, to get also the USB-Stick as an booting option?

[WAWood]

The "standard problem" with new laptops is that they have Secure Boot enabled by default -- and that prevents even "seeing" anything to boot from other than the internal drive.  You have to disable Secure Boot -- and that is usually in the Security section of the UEFI settings.

[Do-AA]

Meanwhile I've detected, the USB-connectors on the right side of the EliteBook-8570w will not work -

I have installed LM21.3/Xfce by using a USB-connector on the left side of the EliteBook-8570w,

But I there's another problem - after installing the Linux Mint successfully, I can't boot it!

I get this messages:

https://cdn.appuals.com/wp-content/uploads/2020/10/Boot-Device-Not-Found-error-768x395.jpg.webp

I've tried to solve the problem gy following this guide

https://appuals.com/boot-device-not-found-hard-disk-3f0-error-on-ubuntu-pc/

but without success,

At last the output of boot-repair has been placed  at 

https://sprunge.us/auiYhX

I can use only the legacy boot mode, trying one of the other both, I get

the message: "ima: error communicating to tpm chip"

I've also tried to get help in a german linux mint forum:

https://www.linuxmintusers.de/index.php?topic=81011.0

I've found no menue point, where I can disalbe TPM, is there anyone?

"Integrierte TPM-Sicherheit" (integrated TPM security) under "Sicherheit" (security)

can't be selected (greyed out), even if I select "Native UEFI (ohne CSM)"

(Native UEFI (without CSM)) and "Secure Boot".

[WAWood]

Sorry, but some of the newer laptops won't let you disable secure boot and it looks like you have one of them.