ya know, if it doesn't have the graphics issue it should be possible.
the problem causing the bootloop is the radio/modem firmware.
the black and white graphics problem comes from incompatible graphics driver that's located in the /boot partition
If you're not graphics issue, then replaceing the radio firmware with the partitions tool should work, I've had no problems using the .img's i provided in the "Backups " part of my Kit.
tho if those files were corrupted somehow....
maybe re-download?
or the hard way is to extract the .dz from the .kdz and then extract the split's from the inside of the .dz file and combine those to create a .img file that you can restore to the device using the partitions tool by wanam.
for working with the kdz stuff you'd need a real linux machine, virt's didn't work.
but tools exist on the web for manipulating the files.
https://github.com/ehem/kdztools
but the python script had to be changed a bit to get it to work with the newer files...
I feel that you've got to be doing part 2 step 5 wrong....
maybe try the tut from scratch after flashing to pp7 with lgup refurbish option, then instead of makeing a back-up with the partition tool, just push My backup to it and "restore " that.
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