cfw 4.89

I have a Phat PS3 CECHA01 OFW v 4.81 and would like to upgrade the HDD to a 1TB. Q: Where can I download Sony's OFW v4.81 to put onto the New HDD when I install it? The Sony web page only shows OFW v4.90. My plan is to install CFW v4.89 after I have fitted new HDD.

1. I am using Rebug 4.84.2 DEX currently, and can sign into PSN, is this safe to do so? - If you have been using DEX and logging into PSN from older firmwares have you been banned faster? - Or is there better chances of not being banned by using latest CFW (currently Evilnat 4.89)? 2. I have...