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Need help installing new cpu

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I have a cpu upgrade question my system specs. are :
Operating System
MS Windows 7 64-bit SP1
CPU
AMD Athlon 7750 25 °C
Kuma 65nm Technology
RAM
ADATA 8GB (4 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400)
Motherboard
ASUSTeK Computer INC. M3A76-CM (AM2) 43 °C
Graphics
VA702b (1280x1024@60Hz)
1024MB GeForce 9500 GT (Undefined) 54 °C
Hard Drives
488GB Hitachi Hitachi HDP725050GLA360 ATA Device (SATA) 35 °C
Optical Drives
Optiarc DVD RW AD-7200A ATA Device
WD Virtual CD 1110 USB Device
Audio

High Definition Audio Device

I have upgraded the RAM to ADATA 8GB (4 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400)
I am upgrading the cpu to :
Phenom IIX4 955 (HDZ955FBK4DGM),3.2GHz,125W,rev.C3,SocketAM3,Quad-Core ALL
1105
Which is listed as a compatible cpu for the board from the Asus site. My board is M3A76-CM (AM2)
and has a ez flash utility for the bios.
I have never installed a cpu or flashed the bios on any system I've had .I've had this pc for a couple of months.
Can some one walk me through the process step by step or any links I can follow . I have downloaded the correct bios file to the pc and copied it to a usb flash drive .I opened the file on the flash drive to make sure it copied and received a message windows will search the internet for program to open the file .Is that because the file is DOS .
Do i flash the bios with the new file for the cpu before shutting down for the install or flash bios after install but before the OS boots.
Is there a new CMOS setting that I need.

All help is appreciated and welcome

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Do you need to update the BIOS to recognize the cpu. You might, but BIOS updates can go the wrong way fast leaving you with a non-working board. Changing the cpu is pretty simple. Pull up and the cpu heatsinks lever to release it. Then clean the cpu and heasink paste off. Then pull up the lever on the cpu to release it. Replace cpu paste, then go in reverse to install the new one. You can probably find youtube videos of how to do it. I suggest that as seeing it happen is very useful. Enjoy your new cpu!


Thanks for your reply hoping I wouldn't have to flash but,

I think I do need to flash the bios, the cpu that is in at present is a
AMD Athlon 7750 25 °C
Kuma 65nm Technology

I'm upgrading to Phenom IIX4 955 (HDZ955FBK4DGM),3.2GHz,125W,rev.C3,SocketAM3,Quad-Core
I have not looked inside the case to check the version installed but thinking the differences between the two would call for and update.
Another thing is the MoBo is socket AM2+, the new cpu is AM3 and the flash file supports the use of AM3
If I didn't flash and installed the new cpu what would happen ?

OK I got into the ez flash setting on start up to backup the current bios and update to the new file this is the window that came up Well I can't get the photo of the screen to paste. Any way I got in but still cannot figure out how to backup the current bios and load the new
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