This worked for me
I ended up pulling this down
adb and fastboot
and putting it in it's own directory ( c:\Android ) and at least this time when running
fastboot devices
I got a ? instead of nothing. So I ran
fastboot flash recovery recovery-froyo-US.img
And it appeared to take based on the output in the command prompt window and on the streak 7 screen. Powered up, mounted external USB, copied LG7-WiFi_506_19534_30.pkg ( wifi only DS7 ) to root of external SD card and renamed to update.pkg .
Ran ROM Manager, installed Recovery ( I have done this multiple times before, but did it again ) then exited ROM manager, powered off. Hold volume+ and power button and wait for green black menu. select Software upgrade via update.pkg and it should take you to the CWM menu
Here is more help
I found out that when I *thought* I copied to SD card before last power down, I actually copied it somewhere else ( internal ? ) so after I got to CWM, I mounted USB and copied it over, renamed and unmounted.
I have had a few Android phones and rooted them and installed custom ROMs. So, while in CWM on the DS7, I select Factor Reset/Wipe, Wipe Cache, go to Advanced, Wipe Dalvik and Battery Stats. I do this for clean installs, but not usually need if it's just a minor update to an existing ROM.
Then go back to apply update from sdcard. Box with arrow pointing Android robot...waiting...waiting...
Edit: i used installed zip, and select zip in CWM, not the .pkg file. The box with the arrow pointing to the android robot wasn't doing anything, so I had to use the safety-pin to reset. Then power+ and poweron button, green and black menu, software update via update.pkg, which took me back to CWM, then install zip, select zip and install. Reboot. The reboot took a while, then it was up to Honeycomb 3.2 , kernel 2.6.36.3