today I try to install rebug CFW 421.1 but when I use downgrade 9.99 to rogero 4.3 everything go wrong.
First xmb dont work, only black screen. Then I change HDD and re install downgrade and now I can see XMB and install pack and rebug options.
But when I try install rebug 355.3 it says corrupt data etc... then I try OFW 3.55 and same message.
I have slim model and no disk on BD.