you should submit a bug report below to help with this issue. ps3xploit team is working on a fix.I'm having more or less the same problem with my CECHC 60gb fat PS3.
I installed the 4.86.1 (HFW) Hybrid Firmware twice per recommendation.
After that I went to bgtoolkit page with my web browser.. It detected that my PS3 supported CFW.
I dumped to USB and ran a check with PyPS3Checker which revealed no errors.
I then restarted the PS3, cleared my cookies and returned to the bgtookkit page.
I selected the download patch via https option and applied the patch successfully.
I then restarted the PS3, dumped the memory and checked it with PyPS3Checker.. Again no errors. bgtoolkit now said I had COBRA syscalls and the ROS banks had changed.
I then restarted the PS3 and attempted to install REBUG_4.86.1_LITE CFW.. It successfully copied the CFW but gave a corruption error after copying.. I've tried other CFW with the same result.. The PS3 is otherwise functional.. I can't reinstall the HFW for the same reasons already mentioned in other posts.
Maybe my summery will help someone.
Look forward to this being resolved.
https://www.psx-place.com/threads/bg-toolset-user-related-issues-and-dump-submissions.28868/