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METHOD 2: Updating Firmware Using Jumper Pins
This method should be used when updating older control boards
that have bootloader version 1.0, or where the PC App has trou-
ble connecting to older firmware. This method will work for all
control boards and can be used on all units.
The firmware comes as a .ZIP file named:
MGL GEN2 Bootload Firmware Vxxx.zip
where xxx is the version reference, e.g. 366 (version 3.66). This
file can be downloaded from www.nordicghp.com, menu For
Dealers --> Download Software.
1. Download the file to your PC. When prompted, "Open" the
zip file. If the zip file is Saved instead of Opened, find it in
the web browser's Downloads list or at the bottom of browser
window and click on it to open. In the window that comes up,
drag the folder containing the required files onto your desk-
top so that it can be found easily, e.g.:
\Desktop\MGL GEN2 Bootload Firmware V366
2. In that folder on the Desktop, there will be three files:
MGL_GEN2_V366.production.hex
PIC32UBL.exe
USB Bootloader Instructions.pdf
Note that on most computers, the file extensions (.exe, .pdf)
will be hidden.
3. Connect a USB (printer) cable between computer and control
board.
4. Turn power off to the heat pump.
5. Remove one of the black pin jumpers from just below the
USB connector on the board and place in on the center pin
pair of the EXPANSION header as shown below.
Borrow any one of these jumpers (however many are present)
Place jumper here
ISSUE 03: 1-Oct-2021
6. Turn the power back on. The control board is now in boot
7. Double click on the downloaded PIC32UBL.exe to run it. In
(firmware file)
(the programmer)
(these instructions)
8. Click on Connect.
9. Click on Load Hex
10. Click on Erase—
Programming...
11. "Programming
12. Turn power off to
13. Move the jumper
14. Turn the power back on. Check that the LCD Display
Page 92
loader mode and is ready to be programmed.
the window that opens, click on the USB Enable check box.
File. Select the
MGL_GEN2_V366.
production.hex (or
higher version num-
ber) file, which is in
the folder you creat-
ed on the Desktop.
Program—Verify
completed. Verifi-
cation successful."
Click on
Disconnect and
close the program.
the heat pump
again.
back to where it
was taken from.
shows e.g. MGL GEN2 V3.66 on the top line during power
up.
002291MAN-03
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