PW4 @ 5.16.2.1.1 never language prompts after 2nd copy

[cdaringe]

Problem

At step 10 (As soon as the "Press the Power Button" screen appears...), I...

• copy the LB files to my PW4 (f/w 5.16.2.1.1)
• safe unmount from macos (using the eject icon)
• then hold power

...but no language prompt screen ever loads.

Observations

• It seems that it really is a race. I have mere seconds to do the full operation, or the device initiates a self-restart anyway.
• everytime i first ;enter_demo and restart into demo mode, i can never ;demo. Entering ;demo freezes for a sec, then brings me to homescreen. I have to fully reboot the kindle (again, for a total of two boots into demo mode), and in the second boot, ;demo works.
• I wonder if the the merge algo perhaps is in play? Can I fully purge all kindle files at the power screen, then copy? Or do I really need a merge with overwrites?

Appendix

Confirmation of files transferred to device root

~/Downloads/LanguageBreak-16.11.23/LanguageBreak/
├── DONT_CHECK_BATTERY
├── documents
│   └── dictionaries
│       ├── a; export SLASH=$(awk 'BEGIN {print substr(ARGV[1], 0, 1)}' ${PWD}); sh ${SLASH}mnt${SLASH}us${SLASH}jb
│       └── amisane
├── jb
└── patchedUks.sqsh

3 directories, 5 files

[conformlorse]

Have the same problem. Did you find any solution?

Upd. Finally i got it. I downloaded and installed the official firmware and reset the settings. After that everything worked correctly. You can also try the one-click method.