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Last days evening, after chatting a little with Nick I had the chance to give an ASUS M2N-MX SE Plus (http://www.asus.com/product.aspx?P_ID=loNjR1kiB2uHkijb&templete=2 ) a chance... My goodness, this was a piece of work for a highly trained professional with nerves of steel!!! 
The installed Athlon 64 X2 3800+ was burnt, so the extra grafixcard because the powersupply was giving, don't know why full power plus 50 percent! But everything else was OK! As the user, a friend of mine once had a terible accident "deflashing" the BIOS there was a socketed BIOS installed wich helped me a lot.
I took an image of the existing BIOS (0503 with support as shown here: http://support.asus.com/cpusupport/cpusupport.aspx ), added the AGESA of the latest nettle2 and the microcode Nick provided in the M2N-XE-BIOS 1802 so kindly. Though I tried to flash it with floppy, USB and CD bootmedium and it didn't work, the flash ended up in a hangup. Then I tried flashing with the external flasher and it did not work, the PC did not start. Then I checked the BIOS file again and it was OK!! Now I gave the hard way a try, booting with a completely new spare BIOS into DOS, pulling out the chip, replacing with the to be flashed chip and flashing the edited BIOS. The PC did it! BUT (!I've done these steps after almost 6 hours of testing!) I had to reset the PC without switching power off and then imidiately setting the CLR_CMOS jumper before it worked as it should! I installed a Phenom X3 705e and it works! Next step is to reactivate the 4th core but this another story...
I will upload the BIOS (The original is here: http://www.asus.com/product.aspx?P_ID=loNjR1kiB2uHkijb&templete=2 or you take the atached one) as soon as possible to let someone give it a try for OC and logos, but I can't get access to the PC without taking a ride for 200km and it is to far...
Greetz and good luck for all others
Tobias
The installed Athlon 64 X2 3800+ was burnt, so the extra grafixcard because the powersupply was giving, don't know why full power plus 50 percent! But everything else was OK! As the user, a friend of mine once had a terible accident "deflashing" the BIOS there was a socketed BIOS installed wich helped me a lot.
I took an image of the existing BIOS (0503 with support as shown here: http://support.asus.com/cpusupport/cpusupport.aspx ), added the AGESA of the latest nettle2 and the microcode Nick provided in the M2N-XE-BIOS 1802 so kindly. Though I tried to flash it with floppy, USB and CD bootmedium and it didn't work, the flash ended up in a hangup. Then I tried flashing with the external flasher and it did not work, the PC did not start. Then I checked the BIOS file again and it was OK!! Now I gave the hard way a try, booting with a completely new spare BIOS into DOS, pulling out the chip, replacing with the to be flashed chip and flashing the edited BIOS. The PC did it! BUT (!I've done these steps after almost 6 hours of testing!) I had to reset the PC without switching power off and then imidiately setting the CLR_CMOS jumper before it worked as it should! I installed a Phenom X3 705e and it works! Next step is to reactivate the 4th core but this another story...
I will upload the BIOS (The original is here: http://www.asus.com/product.aspx?P_ID=loNjR1kiB2uHkijb&templete=2 or you take the atached one) as soon as possible to let someone give it a try for OC and logos, but I can't get access to the PC without taking a ride for 200km and it is to far...
Greetz and good luck for all others
Tobias
Sometimes you just have to try to be sure it is not working...
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I am back in here as I promised! So tell me your needs!
I am back in here as I promised!
So tell me your needs!
) ive now got a much better way of upgrading AMD AGESA integrated into the 1B module in AMI bioses! 
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