Earlier today I downloaded BIOS_Acer_1.11_A_A.zip from Acer's web site and ran the TMBI0111.exe executable it contained.
My laptop rebooted as expected and the flashing process ran to completion (100%).
It rebooted again but remained stuck at the Acer boot logo (without the dancing dots).
Now the laptop won't boot at all. If I switch the machine off, then on, the same thing happens: stuck at Acer boot logo. I cannot enter the setup utility (F2) either.
Note that the machine still reboots when pressing Ctrl-Alt-Delete, and the keyboard illumination command (Fn-F9) still works.