This bios is only for the M537 motherboard, NOT the dma version. My motherboard is revision 3.1 (two large brass heatsinks), but this bios will also work with revision 5.1 (switching power supply).
This bios is useful because it supports hard drives up to 32 GB. This is not the newest, but it does support the large HDs.
Remember, this is for the VX Pro M537 only. If you have revision 5.2 or higher, you need to keep looking (5.2 and higher are DMA boards).