Exactly how do you update the DM42 Firmware?

[Geoff Quickfall]

One more post.

You are confusing issues here. Reset is for a hung calculator; be it accidentally starting a Bootloader condition from the calculator SETUP menu or a hung program that stalls the CPU..

The calculator should NOT be attached when installing the USB driver on the computer. The reset as explained above is a calculator physical reset restarting a stalled calculator CPU.

It seems that you are having a Windows issue installing the driver using:

https://www.swissmicros.com/dm42/doc/libusb_install/


That is a windows issue. Maybe turn defender off and any other antivirus you have then try:

https://www.swissmicros.com/dm42/doc/libusb_install/

As stated it will automatically install the stm driver.

Finally, the order in which to install requisite utilities and firmware:

- install driver,
- install dm_tool,
- download latest firmware,
- execute,call,invoke dm_tool,
- connect calculator to USB.
- SETUP/System/Enter/Bootloader
- see handshake on dm_tool pop up.
- Browse to find firmware (where you saved it).
- Hit program on dm_tool pop up
- watch progress,
- disconnect and enjoy.


Fixing windows problems over a forum is like diagnosing a patient remotely. Very frustrating, and that is Windows fault, not yours.