Beware, don't upgrade your N0110 calculator from Numworks site!+
If you have upgraded from Numworks site, your calculator is locked
and therefore incompatible with KhiCAS. Thanks to M4x1m3,
there is temporarily a
workaround to unlock your N0110 Numworks,
follow instructions here.
If the workaround fails (if you made an update from Numworks site
after 22/03/28), the locking process is (almost) irreversible,
the only known workaround for N0110 is explained
it requires some additional hardware and opening the calculator (beware
it does not work on N0115 and N0120).
If your calc is a locked N0110 or a N0115 or a N0120
you can still install a crippled version of KhiCAS from
If you install Khi+KhiCAS from this site, it will protect
your calc against lock from USB connection.
You will have to press reset and 4 simultaneously to open
the bootloader in order to access flash.
Beware, don't do reset+4 or reset+6 unless you are sure to be
on a safe site, if you do that on Numworks site, you might
end up with a locked calculator.
If you want to certify that a N0110 calculator firmware is
a genuine version of Khi+KhiCAS, click here
This test takes about 30 secondes
These tests may be done by a proctor during an exam with a
smartphone from this
Click here if your N0110 is stuck.
Connect the calculator, press the 6 key, enter a pin in the RESET
on the back (keeping 6 pressed), release the 6 key. The screen
should remain black, while the red led is visible. Otherwise
your calculator is probably locked,
-If you see http://... tries to connect, click on
STM32 BOOTLOADER then click on
-If rescue does not work, try with Xcas PC. On windows, check that you have a driver for STM32 BOOTLOADER, you can install one from Zadig.
🛈 If the calculator connection does not work:
If the calculator is on and the calc does not display
"Calculator connected", unplug and plug the calc
If the calculator is on and the calc displays
"Calculator connected", try the Detect button.
If the calculator is off even after unplug and plug,
try the Rescue button
This kit works only with a webusb compatible browser, like Chromium,
Chrome or Edge and from a web server. Firefox does not have support
for webusb for security reasons. If you don't want to run a webusb
compatible browser, you can connect your Numworks with
(version Windows, Linux et Mac).
For experts who want to run this page locally,
activate a local webserver, for example by running from a Terminal
the following command python3 -m http.server
from the directory where you have unzipped
xcashtml.zip, then click on
Thanks to Maxime Friess for his script
Numworks.js (MIT licence). This page is also using
tarballjsJSZip to read
zip files and FileSaver.js
to save files.
Thanks to Zexi Ru and Elio Poletti for the initial page style.