BIOS setup on ARMADA 1575D

Hi guys,

I'm unable to access to the BIOS of that laptop: neither F2, nor F4,
F10, Del, Canc, Alt+Esc keys
seem to work.

Once powered on the amount of RAM is shown (64MB) on the left side,
the cursor as a LINE still
below but there is no way for me to go in the CMOS settings...

Could anyone help me?

Tnx
ZpP