[Q&A] USB soft brick + how i fixed it. - Legend Q&A, Help & Troubleshooting

I'm Working on a HTC Legend for a friend.
And after Rooting and Installing a Custom rom, I sudenly could not access the sdcard annymore. So I revert ( STUPID ) to 1.31 rom.
And start over. But I could not get the USB port to work anny more. Getting errors like: error: device not found ,with adb commands. and in windows Unknown Device ( error 43 ) no driver helped.
sollution:
Source: http://android.modaco.com/topic/309961-usb-brickrickrolledb0rked-fixed/
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Also, SD card functionality has to work. For this, do 'fastboot oem enableqxdm 0' in fastboot mode.
Steps involved:
1. Find out your CID. Go into fastboot mode, and do 'fastboot oem boot'.
The log will say something like the following:
Code:
#INFOTAG:Ramdisk OK
#INFOTAG:smi ok, size = 0
#INFOTAG:hwid 0x0
#INFOTAG:skuid 0x21F04
#INFOTAG:hero panel = 0x0
#INFOTAG:engineerid = 0x0
#INFOMCP dual-die
#INFOMCP dual-die
#INFOTAG:mono-die = 0x0
#INFODevice CID is not super CID
#INFOCID is HTC__E11
In this specific case, the CID is HTC__E11.
2. Get the following mtd0.img from here or from here: mirror provided by SgtDavePwnage.
Edit this image to the CID you found above with a hex editor.
3. Get flash_image from here or from here: mirror provided by SgtDavePwnage.
Move this to /data/ , and flash the modified image using:
"/data/flash_image misc /data/mtd0.img"
You can move both mtd0.img and flash_image by putting it on your sdcard, and issueing the following command in a terminal emulator:
'cat /sdcard/flash_image > /data/flash_image'
'cat /sdcard/mtd0.img > /data/mtd0.img'
You might have to do 'chmod u+x /data/flash_image' before you run the commands (or chmod 755 /data/flash_image)
4. Repeat step 3 a couple of times if it doesn't seem to work well.
5. All done! Reboot, you should have normal usb connectivity. Post your 'fastboot oem boot' log and intermediate steps if it fails.
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Click to expand...
Click to collapse
After that I followed the r4-legend-root Step 1 and skipped step two by placing Clockworkmod as update.zip on the SD.
Recovery Vol up + power. And I was back in the game. { I lost that other game while typing this }
It took me a while to learn all this. In 24 Hours 5 hours of actual work and even more frustration. But I'm There.
I hope this helps you as it did me.
Right now I'm fiddeling with customisations to
[ROM][RC1][17.07.2011] Gingerbread 2.3.3 with HTC Sense 2.1
Getting all his apps in the Rom, saves space in data.