PS3 Firmware 4.88 released, do not update just yet

In a somewhat surprising (but not unheard of) move for a discontinued console, Sony have released a firmware update for the PS3. Firmware 4.88, released half a year after 4.87 (December last year), is

PS3 - 4.88.1 HFW (Hybrid FirmWare)

Warning PS3 New Update 4.88 Do Not Update 2021

How To Install HEN 4.88 On PS3 (Quick Update)

How to get PS3 Firmware update for installing on PS3 or PS3

PS3: Homebrew ENabler 3.0.3_4.88 released for Firmware 4.88

PS3 system update 4.89 removes PSN account creation

PS3 Firmware 4.88 released, do not update just yet

New PlayStation 3 4.90 firmware update released, Page 2

Tutorial - ☆ [PS3/TUT] Ultimate 4.88 Jailbreak Tutorial