Acer Veriton Z4621G, Service Manual

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4-8 Troubleshooting
BIOS Recovery
0
1. Put the BIOS.ROM (like P01-A0) to a bootable USB memory key (Disk on Key,DOK).
2. Install the DOK to the system
3. Press power button to boot the system.
4. The BIOS recovery function will be executed. (you will head a long beep and one short
beep)
5. Press <Del> to enter BIOS setup menu when you see the logo and message
Checkpoint Description
E0 Initialize the floppy controller in the super I/O. Some interrupt vectors are
initialized. DMA controller is initialized. 8259 interrupt controller is
initialized. L1 cache is enabled.
E9 Set up floppy controller and data. Attempt to read from floppy.
EA Enable ATAPI hardware. Attempt to read from ARMD and ATAPI
CDROM.
EB Disable ATAPI hardware. Jump back to checkpoint E9.
EF Read error occurred on media. Jump back to checkpoint EB.
F0 Search for pre-defined recovery file name in root directory.
F1 Recovery file not found.
F2 Start reading FAT table and analyze FAT to find the clusters occupied by
the recovery file.
F3 Start reading the recovery file cluster by cluster.
F5 Disable L1 cache.
FA Check the validity of the recovery file configuration to the current
configuration of the flash part.
FB Make flash write enabled through chipset and OEM specific method.
Detect proper flash part. Verify that the found flash part size equals the
recovery file size.
F4 The recovery file size does not equal the found flash part size.
FC Erase the flash part
FD Program the flash part.
FF The flash has been updated successfully. Make flash write disabled.
Disable ATAPI hardware. Restore CPUID value back into register. Give
control to F000 ROM at F000:FFF0h.