In case it saves someone else's bacon, I thought I'd post my findings.
I rebooted into windows and tried the 'one click transformer root' tool. It runs and then tells me that it cannot deal with my tablet as it is not running ICS. I tried another one called which is supposed to return to stock called EasyFlasher 0.83. It acted like it installed the stock image, but did not do anything. It would always reboot to CWM.
In CWM., I could wipe and flash an image, but it would never boot. Just bootloop. I had CM10 on the tablet and am guessing that the install was not quite kosher. I could not install any other recovery image, either.
To solve it, I downloaded the blob tools
Blob Tools
I already had wheelie since I used the CM page to install it
CM10 install
I unpacked the image by first unzipping the zip from asus. IN it was a file called 'blob'. I then unpacked it:
it created 4 files called blob.APP, blob.EBT, blob.LNX and blob.SOS
We want the blob.SOS file. I put it in the wheelie directory and modified the commands I used to initially install the CWM recovery:
Code:
# ./wheelie -1 -o 0x300d8011 --bl bootloader.bin -c transformer.bct
Wheelie 0.1 - Preflight for nvflash.
Copyright (c) 2011-2012 androidroot.mobi
========================================
Using SBK type 1.
Using bootloader: 'bootloader.bin'.
Using BCT: 'transformer.bct'.
----------------------------------------
[=] Chip UID: 0x370018042607097
[=] RCM Version: 0x20001
[=] CPU Model: Tegra 2
[=] Secure Boot Key Set: Yes
[+] Sending BCT
Sending file: 100 %
[+] Sending ODMData 0x300D8011
[+] Sending bootloader...
Sending file: 100 %
[!] Done - your device should now be ready for nvflash
# ./nvflash -r --download 5 blob.SOS
Nvflash started
[resume mode]
sending file: blob.SOS
\ 4284416/4284416 bytes sent
blob.SOS sent successfully
# ./nvflash -r --go
Nvflash started
[resume mode]
My zip file was in the root of the SD card, so it immediately reflashed itself after it rebooted. Finally!