If I have a Dex jailbroken PS3 on 4.84, can I still get online even though the latest version is 4. 84? If not, how do I update it without ruining the jailbreak? - Quora
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How to install Custom Firmware on the PS3 with FW 4.82 - Hackinformer
PS3 System Update 4.80 Now Available To Download | Attack of the Fanboy
No Applicable Update Data Was Found - PS3 [SOLVED]