1-SEND IT TO SONY AND ASK SPECIFLY FOR A SOFTWARE REPLACEMENT, this will cost about 40euros, (i sent mine and they told me that they would have to replace the lcd???) i will make a formal complaint about this idiotic budget request
2-REPLACE THE MOTHERBOARD. I bought a second one and replaced all pieces into the bricked one and thats what does it. i tried to replace only the flash memory but that didnt work. unfortunantly the 2 tablet are from different zones so i cant say if that was the problem.
there is nothing wrong with the hardware in our bricked tabs but since there are no software solutions out there yet these are the only two possible things so far.