Hmm I didn't know that. I thought all tf300 used same driver. I saw your other topic about boot it.to from _that. All the previous problems I read from other users they had the same problem. The transformer doesn't check first the volume down method, so it needs boot it. I think it will work and boots directly in the right boot loader. It will be the first thing I check in the morning! Thankss!
edit: It worked with this guide: http://forum.xda-developers.com/tran...guide-t2853546
But, there was 1 thing extra, my fastboot drivers were good, but the fastboot.exe was not good! I installed a new one from this link: http://forum.xda-developers.com/show....php?t=2588979
Now it works! thanks!