[playerkp420]

Originally Posted by baileyscream thats interesting with ros0 being empty i wouldnt have thought the ps3 would have booted up. you live n learn every day here did you see any other differences with the other folders after resoring? and thanks for that player

No other differences that I noticed.
Downgrading to Rogero v3.7 does the same thing. The ros0 folder gets filled back while dehashing. Or if you reinstall the firmware.

I remember talking to @haz367 about it, awhile back.