Uploaded July 2022 | Updated September 2026, 2 weeks ago
The HP 15C LE was a 2011 re-release of the HP 15C, however, it was using an ARM processor running a NUT emulator.
The 15C LE was released with a significant bug, the PSE function only worked once and then the display would go blank for the remainder of the program without the ability to display any results or accept input.
Although the 15C LE was flash upgradable, HP never released an update to resolve this well known bug.
This video demonstrates the bug and provides and demonstrates a fix.
Note: This procedure was tested multiple times with no issues, however, please proceed at your own risk on your own calculator.
HP 15C LE bugs:
hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=1089
Details for making your own software upgrade cable:
hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv021.cgi?read=229916
hpmuseum.org/forum/thread-183.html
web.archive.org/web/20190402142724/http://www.thereminworld.com/Forums/T/29229/diy-calculator-hp30b-to-wp34s
--- Contents ---
0:00 Intro
1:28 Release software checksum and date verification
1:55 Demonstration of PSE bug in a program
2:44 Software load
6:07 Fixed software checksum and date verification
6:33 Demonstration of PSE working in a program
7:31 Conclusion
The HP 15C LE was a 2011 re-release of the HP 15C, however, it was using an ARM processor running a NUT emulator.
The 15C LE was released with a significant bug, the PSE function only worked once and then the display would go blank for the remainder of the program without the ability to display any results or accept input.
Although the 15C LE was flash upgradable, HP never released an update to resolve this well known bug.
This video demonstrates the bug and provides and demonstrates a fix.
Note: This procedure was tested multiple times with no issues, however, please proceed at your own risk on your own calculator.
HP 15C LE bugs:
hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=1089
Details for making your own software upgrade cable:
hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv021.cgi?read=229916
hpmuseum.org/forum/thread-183.html
web.archive.org/web/20190402142724/http://www.thereminworld.com/Forums/T/29229/diy-calculator-hp30b-to-wp34s
--- Contents ---
0:00 Intro
1:28 Release software checksum and date verification
1:55 Demonstration of PSE bug in a program
2:44 Software load
6:07 Fixed software checksum and date verification
6:33 Demonstration of PSE working in a program
7:31 Conclusion
