click here for Belarc Advisor which will tell you all the details of your system, including the motherboard. Most of the time, it's quite accurate, but use it as a guide only.
Other than that, here's what I can gather from the PCChips site.
Clarity of support information is not one of PCChips' strong points, not helped by the changes they have made recently to the naming of the models and BIOS structure.
The model name of your mobo was originally M810LR. L stood for Lan, R apparently stood for Ready (whatever that means, shouldn't they all be ready?). PCChips have changed the nomenclature, and now R stands for RAID. So M810LR is now called, on their website, just M810L.
The M810L v71c is a mobo with an onboard Duron processor. Since you have an Athlon XP, you can ignore that model on the website (C stands for mobo that comes with onboard CPU).
That leaves M810L, and M810L v7.x. Can't take it any further. I notice that on the first page of the downloaded manual, there's a copyright notice, which refers to the series of mobo, with a version number, e.g. M810 series, V7.1G 9which may be a more recent version). Look at your own manual and see if you've got something like that, V7.x. If so, your model may well be M810L v7.x. If not, it's just the M810L, but I really can't be sure.
What makes things worse is, together with renaming the models, the BIOS structure has also been changed, so that with some older existing BIOS, when you flash a new BIOS on certain boards, you may get an error 9 message, warning you that you've got the wrong BIOS flash, when it's actually correct. This does not appear to apply to the M810 series.
Look at their News section to read up on the model name changes, and BIOS structure changes.
So when you flash the BIOS, if you do get the error message, you had better stop, and try the other one.
Hope that helps.