PS4 Firmware 5.01 released, nobody knows what it does - Wololo.net
PlayStation 4 Slim Edition 1000 GB Black Console for sale online | eBay
PS4 Firmware 4.55 Modified to Be Compatible with Firmware 5.50
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PS4 System Software 4.55 released (now with more stability) : r/PS4
PS4: How to get your hands on a PS4 with a 4.55 firmware or lower - Wololo.net