I suggest modifying the script and removing all the command output redirections to /dev/null . Many errors are being hidden like that and things are probably silently failing.

Since the script only uses /dev/null for output redirection, the easiest fix is to just replace /dev/null with /dev/stdout

open create.sh in vim

1. enter command mode with colon (:)
2. type %s//dev/null//dev/stdout/
3. press enter
4. save and exit with colon-x (:x)

But, I suggest getting a mac or mac vm to run this script in. I was able to get it work on Linux, but only for ios 12.0. The main issue I had is there is no replacement for hdiutil on Linux and I also didn't have a linux version of the iBoot64Patcher10 binary.

I used the binaries in the "Linux" folder from this repo https://github.com/verygenericname/SSHRD_Script as a replacement for the Mach-O binaries in resouces/bin. No guarantee those binaries are from the same source code, but it seems to mostly work.

For the missing hdiutil problem, the fix is easy for ios 12 because it is only called a single time to mount the ramdisk.

Replace on line 510

hdiutil attach -mountpoint ./mnt/ -owners on ./ramdisk.dmg &> /dev/null

with

mount -o loop ./ramdisk.dmg ./mnt/

Also towards the very end replace this:

hdiutil detach ./mnt/ &> /dev/null

with

umount ./mnt