INVALID CHECKSUM: Motorola SBG6580 wireless modem router and software updates (10.7.4)

Tried to install 10.7.4 via software update dropdown on my MacMini over ethernet on my home computer network, failed. Downloaded Combo Client 10.7.4 update from apple.com. Downloaded fine. Failed to mount with invalid checksum error. Tried to download on Win7 Dell laptop on my same home network via Wi-Fi, and copied to MacMini via USB flashdrive. Copied ok, but mounting returned invalid checksum again. Went to work, downloaded Combo Client 10.7.4 onto USB flashdrive, came home, copied it, mounted and installed just fine!
So, kept trying to download Combo Client from apple.com on my home MacMini. Kept failing, invalid checksum. Did this about 20 times during a few days, and actually got two of them to mount without the checksum error. Realized that something in my network was failing, intermittently.
Figured at this point it was either the Motorola SBG6580 modem wireless router or Comcast cable ISP service.
Went to best buy and bought a new Motorola SurfBoard SBG6580. Installed it, provisioned it with Comcast. Took about 20 mins with Comcast pushing over the same new Motorola firmware that was released in MID FEB 2012. I think it is 3.3.1. Tried to download Combo Client and invalid checksum again. Installed a new Motorola SurfBoard SB6121 modem (which has a very different firmware BTW) and it download and mounted the Combo Client 10.7.4 update just fine!
Realized it was the firmware that was causing it, not a broken modem.
Comcast pushes over cable automatically new firmware that is given to them by Motorola. Apparently no did a thorough check large DMG files that require a checksum and it is therefore somehow corrupting them when downloading. Earlier this year the firmware was updated 3.1 to 3.3.1 then Comcast pulled it and downgraded all SBG6580 back to 3.1. Then in mid Feb they reuploaded 3.3.1 firmware. That is the one causing the problems.
You can either wait it out till they push a new one that fixes it, and have all your large DMG files transferred from another internet connection and copy them over, or just get rid of that horrible SBG6580. That is what I did and now using a Motorola SB6121 modem with a Cisco EA2700 wireless routher.
Let me know if any of you are also experiencing this issue and if/when Comcast/Motorola will fix it.

No, nothing custom that I did. Besides turning off the WPS thing as a possible security problem (we dont need it anyway) and setting the wireless passwords/SSID/channel stuff, everything is as it was factory or changed by Comcasts profile.
It's obvious if you replaced the SBG6580 with a two-peice combo and the problem went away, that it seems to be with the SBG6580. Just weird to me becuase a problem like that would almost seem more like a hard disk or web browser problem. TCP/IP has a checksum/retransmission layer or protocol built in, if short or defective packets show up, they would be sent again.
I mean I've seen like cheap 24 port 10/100mb switches running at 100% throughput, to the point they reboot. Anything connected to them stops or slows down but generally get going where they left off, unless the connection got severed.
I'm just saying a bad iso or dmg file, had to had bytes changed or missing, like the web browsers buffer or a bad block write on the disk drive saving it. There was a lot of talk about the SBG6580 on dslreports and comcast discussion groups, would be interesting to see if anyone else mentioned it for that model.

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Hello Jo Sugden. Welcome to the Apple Discussions!
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If not, is there any benefit to setting the AE up as the router instead of using the Netgear?
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Hi,
Welcome to the  Discussions
On the changing the port front stop off on the Account Info tab on the way a deselect "Use this Account" to take it Off Line. (you can get half way states)
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9:14 PM Saturday; September 25, 2010
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

INVALID CHECKSUM: Motorola SBG6580 wireless modem router and software updates (10.7.4)

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