Exactly how do you update the DM42 Firmware?

[Geoff Quickfall]

Assuming you have windows 10.xx:

A). Production DM42 does not have PGM pin hole. It does have a reset pinhole. Reset hole t9 be used in a hung state or to exit bootloader mode.

B). To navigate the setup menu on calculator use ‘up down’ keys or line select by pressing associated key aligned with the title in the menu.

C) on your computer create a DM42 folder and sub folders labelled for example:

- backup, dmtool, firmware updates and whatever else you want.

D) failure modes involve bad USB cable, windows update removing unsecured drivers, security scan removing updated drivers. All involve envoking administrator and reinstalling the driver back to the computer.

E). Download and unzip from here: Update 3.1. You may or may not have to envoke administrator permissions to load driver on your computer. This is window fault to avoid hacking, malware and etc. It does make everything awkward.

1) install the correct driver on your computer using these instructions: Driver installation for computer. You may or may not have to restart your computer.

2) plug calculator into computer USB port.

3) on calculator call up setup menu and select.

- SETUP/File>/Activate USB Disk >. **if all is correct you should see your FAT directory on a windows file folder on your computer screen. At this point I create a back folder on the computer and copy the FAT over to a backup folder labelled DM42/backup.

- SETUP/Calc State/Save State. ** if you have programs already installed this will save them for reloading later if required. This should not be required if all goes well.

- eject the USB DISK with the EXIT key on the calculator or eject the USB drive from the computer. Remove the cable from the calculator.

4) install the latest DM42 tool file from: Latest dmtool for dm42

5) on computer, once dmtool is loaded by the windows wizard, envoke (call) dmtool.exe.

6) on calculator:

- connect the calculator to the computer. Remember, dmtool is called first then calculator is plugged into computer USB.

- SETUP/System/Enter/Bootloader.

- on dmtool window on computer screen you should see a handshake between the calculator and the computer.

- select browse on the dmtool window and find the updated firmware file on your computer.

- select the file.

- select program on the dmtool window.

-watch the magic.

Geoff

P.S. once you have done a few of these it becomes muscle memory which is why the old hats (beta testers) at this breeze through it.