I have been using trout along with the N+S 000M keypress to debug this issue, there were no keypresses that were responsible for the missing data, at least none stored to the file.
I am going through the upgrade procedure now. I first reformatted the drive to (Microsoft DOS) FAT, which should be the FAT12 as opposed to EXFAT. Unfortunately when I drag and drop the file with the finder (I'm on a OS X) it gives me an error message:
The Finder can’t complete the operation because some data in “Twiddler_0.15u.hex” can’t be read or written.
(Error code -36)"
I was able to get the file to transfer by running the following:
mv ~/Downloads/Twiddler_0.15u.hex /Volumes/NO\ NAME/Twiddler.hex
No complaint was given, so I proceeded with the rest of the upgrade instructions. Unfortunately it has been at least five minutes and the twiddler continues to blink green. At first they appeared to be random blinking patterns, but now it seems to have settled into a two or three quick pulses on and then a long pause off. Sadly the instructions don't give any indication of what error codes indicate an unsuccessful upgrade. Also, the video shows the twiddler rapidly blinking green while the instructions indicate that it should blink orange and green.
I turned the unit off and then back on, and it acts normally but gives that it's version is still 0.13b. I ran N+S 000R0 again and no difference.
So I'm suspecting that the command line move was also unsuccessful, which would lead me to believe that my unit has problems with file writes or something which is causing appends to not work and file transfers to also have problems. Perhaps there is not as much memory available on my unit as it describes?