PlayStation 4 News: TheFlow advises to stay on FW 6.20 or below if you want to hack your console - kxploit currently in the works! - Wololo.net
PS4-6.20-WebKit-Code-Execution-Exploit/README.md at master · Cryptogenic/PS4 -6.20-WebKit-Code-Execution-Exploit · GitHub
PS4 Testing Kit on 6.20 Firmware Debug Settings Overview by MrNiato | PSXHAX - PSXHACKS
EdiTzZ™ on Twitter: "Added PS4 WebKit Exploit PoC for 6.XX by @C0rpVultra https://t.co/X6jw3Q5yGE Note: This is only a WebKit Exploit no Kernel Exploit!" / Twitter
Kernel Exploit for Sony PS4 Firmware 4.05 Released, Jailbreak Coming Soon