> Lenovo are currently investigating what went wrong

I've just heard back from them. The bricking should only only occur on
these selected models when you upgrade from a very old firmware version
to a very new firmware version. This is because the old (as in the
version you're upgrading from) firmware had a bug that meant the screen
was not initialized correctly and the update progress bar was not being
shown. The beeps actually mean "flashing, don't turn off" rather than
"system error".

> After about one minute I manually switched off the system via a 5
second press on the power button

This is when the firmware was actually being flashed -- but of course
you didn't know that :(

Lenovo are preparing a new update that checks the previous firmware
version before being scheduled. This should be on the LVFS in the next
few hours.

They also shared some guidance about how to recover a bricked machines:

* Remove all power supplies, which includes the AC adapter, the main
battery, *and* the coin battery.

* Press and hold the power button for 30s.

* Attach all of power supplies and press the power button to power on
the computer.

Depending on when the firmware update was interrupted this may or may
not recover the laptop.

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https://bugs.launchpad.net/bugs/1791407

Title:
  Thinkpad L570 UEFI destroyed after BIOS update

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