Hmmm could be a problem with recovery but... could be a problem with the zip file.
As i am on a late model b70 as well i have been stuck a few times like that as well.
just to double check because these are the things that got me when i was stuck
did you unzip the downloaded file and copy the /asus/update/updatelauncher.... to the sd card
did you rename the file (update launcher) to EP101_SDUPDATE (this is case sensitive) and put it in the root of the SD card
Reboot to recovery volume and power down then when you see text in the top left corner press volume up?
anyone of these steps missed would cause the android with the triangle
Edit: If it boots to eee pad logo you should be able to save it. The only things that would give you the triangle would be the above and possibly wrong region code
LG gt540 - CM7
Samsung Galaxy Y-
Asus EEE pad TF101 -