(adsbygoogle = window.adsbygoogle || []).push({}); I want to downgrade to 3.55 from 4.21.1 REX.
So I put the 3.55.3 REX on my usb and try it from the xmb but the update is shaded out and it keeps saying data is corrupt.
When I go to recovery menu I get the same problem.
I have QA enabled so I should be able to downgrade.
I can't find a working download for 999 Downgrader so please help guys.

1. Visit the website "Rebug.me"

2. On the home page, scroll down to about half way down the page.

3. There will be 4 Rebug firmware downloads, pick the 4th one.

4. "REBUG_3.55.4_999_DGR_PS3UPDAT.PUP – 06aa0e07af7ead6e7e4bddf18ea3281f" will be the name of the 999 firmware you need.

5. Extract when downloaded and you will find the files there.

YOU KNOW THE REST.

Thanks man.