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I was able to solve this issue with the RGN_Tool.exe. Dropped 029201000400.rgn file You cannot view this attachment. into the RGN_Tool.exe "File Drag Zone"; modified the boot.bin and fw_all.bin HWID from 292 to 1111 ->You cannot view this attachment.  saved modified renaming to 00f201000400.rgn.

Then dragged modified file, 00f201000400.rgn over Updater.exe and flashed successfully!  All languages are now available.

Do this at your own risk! Your mileage may vary.

FWIW, I can see all the uploaded screenshots in this thread using latest Google Chrome under Windows 10 Pro N., but only after I login.  Before logging in: "You cannot view this attachment."

Thanks for all the responses here.

I spent an hour on phone with Garmin CS. I shared my phone camera with Daniel and walked through the issues with him watching. He asked for internal help. Came back with some interesting ideas.  Apparently, ARABIC language was added at some point to this device.  He doesn't know why the unzipped update fails to write.  Probably something with the additional ARABIC in a name pattern check.  He wasn't able to provide further help. 

Hacking the updater.exe is a last resort.  Or cloning the flash chip?

WebUpdater fails as shown in the screenshot attached. So does the updater standalone from Garmin for the 78CSx. This model only has English and Arabic languages. Is there a firmware update available that might work?You cannot view this attachment.