How did you go about changing the Hen 2.1.3 to Hen 2.1.3b? Or could you share the files you have of your custom build v6 before they're put into arduino?
I built the V6 myself following this tutorial some months ago and changed SSID and password so the first character was different from my "live" internet and the dns I changed to the two Al Azif is using, so I wouldn't have to change DNS every time I changed networks on my PS4, I could leave that as is and only change network. I regularly test out Al Azif, Darkmodder and ESP8266, so having to remember a completely different password and to change the dns's evertime i changed networks would be a hassle. That's why I prefer to change it in the PS4Exploit.ino before I build in Arduino.
EDIT: Don't worry. After some trial and error I figured it out.
Here it is HEN 2.1.3b payload
https://mega.nz/file/114WRaIQ#opa7gfiMdAoOQdKDMdoIzyaPOgqKQYV6EC0lU4o_euI