Pali,
what does it really mean rootfs is corrupted, because everything working except your newer u-boot version it cant load kernels, with older version rootfs is not corrupted and everything works like a charm. Is there any way to solve "corrupted" rootfs without flashing it ?

peterleinchen,
I tried this. After fails of loading the power or stock kernels with 2012-04-2 version I flashed via USB same stock and power kernels and both boots up without problems And reinstalled u-boot both packages tools and flasher so many times, even i can't count it :P still same problem. But.. if I install 2012-04 version no errors and u-boot loads kernels without problems - no errors about corrupted rootfs.