Fire30 shared on Twitter some PS4 Firmware 6.20 Build Strings which have been added to the Dev Wiki displaying the current status as 'dumped' leaving many asking the proverbial question of ETA WEN for a public kernel exploit release to complement the PS4 6.XX JSC_ConcatMemcpy WebKit Exploit so PlayStation 4 consoles on recent Firmware can be jailbroken.
Previously Fire30 publicly released a PS4 Webkit Exploit PoC for 2.XX OFW, PS4 HENkaku Exploit for 3.55 Code Execution and FireKaku PS4 3.15 / 3.50 OFW Ports of the exploit... so although he may decide not to do a public 6.20 release at least he has a track record of sharing his findings publicly with the PS4 scene in the past.
To speculate briefly, besides obvious legal hassles a reason he may opt against doing a public 6.20 kxploit release is what developer @Mathieulh (Twitter) mentioned on Discord last month... to quote:
"No one is interested in doing a release for various reasons including how we don't have any other exploit chain after this one "
Like it or not, that's a compelling reason to keep things private (for the moment) among PS4 developers since end-users can still obtain jailbreakable consoles if they're willing to pay what those selling them are asking.
Code:cat 620.elf | head -c 4096 | sha1sum 2e83ab92cf84da74b526db13500f4611583f7c45 -
Code:r109816/release_branches/release_06.200 Nov 2 2018 05:41:33
PS4 Testkit Build String (5.50 - 6.20) via MrNiato
Code:6.20 : r109816/release_branches/release_06.200 Nov 2 2018 6:41:43 AM 6.02 : r108670/release_branches/release_06.020 Oct 15 2018 3:37:52 PM 5.55 : r96810/release_branches/release_05.550 May 10 2018 12:40:23 PM 5.53 : r91210/release_branches/release_05.530 Mar 28 2018 6:30:33 AM 5.50 : r90807/release_branches/release_05.500 Mar 2 2018 6:29:37 AM
Thanks to @MrNiato (Twitter) for passing along this news earlier on!