Thank you very much.
I did wipe all these couple of times.Some of them deny access or there are no data at all to delete so i get a failed message.
So, let me sum what i have to do.
1. Install Stock Asus 4.1.1 http://forum.xda-developers.com/show....php?t=1893714
2.Install a new TWRP openrecovery-twrp-188.8.131.52-tf300t-ICS.blob
3. Go in TWRP do a data wipe, cache wipe
4.Flash a new custom rom.
5. Flash latest TWRP.
Please confirm that these are the correct steps.I got chills after this adventure!Even though i am familiar with android rooting and ROM flashing, TF300t seems to be a whole new chapter.
Those steps look basically right to me, just some remarks:
Pick the latest Asus ROM 10.6.1.27.5. If you don't find it in the tread, download from Asus web site.
According to your bootloade version, make sure it is the "WW" version (not "US" or "JP", etc.).
After step one, before flashing TWRP, actually boot into the Asus ROM once.
Step 5 should not be necessary, as flashing a custom ROM should leave your recovery untouched.
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