This same issue or similar is happening to me, I do have a super slim (CECH-4011B) and i had to revert back to OFW and reinstall HFW 4.92.1 but it still ended up not working after a while. This happened after a while of me using it normally but i did notice issues booting into multiMAN or some...
I am currently having this same issue, and the only way i seem to be able to enable HEN is through the browser. I had formatted my drive and tried installing HEN again but it did the same thing and just didn't seem to work, it just showed the browser and then exited without a notification...