HP 48gII USB Support/OS Upgrade

I have 2 HP 48gII calculators. The newer-released(??) one has two I/O ports, uses 4 batteries, and has a hard slip-on cover. The I/O port D-connector connects to my computer USB port and works fine with the connectivity (Conn4x) software provided by HP. I recently acquired another HP 48gII which has only one I/O port which is the D-connector type, uses only 3 batteries, and does not have a hard cover. When I connect this older-designed calculator to my computer using the same cable as with the first HP 48gII, the computer does not recognize the device. The calculator which doesn't work does have the Xmodem capability. Does this mean that my operating system (VER 4.20031005) needs to be updated to that of the "newer" calculator (VER 4.20060106)? First, is the operating system upgradeable on a 48gII? If so, how can it be upgraded if no computer connection can be made? Can an OS be transferred from one calculator to another?

Hi,
About firmware versions:
What you quote seem to be the hardware versions, obtained by typing VER.
To get the OS firmware version, type VERSION, you should get a response similar to:
"Version HP48-C Revision #2.08 Copyright HP 2006"
Updating the firmware:
As far as I am aware the 48Gii OS is not update-able, neither have any OS files been released by HP. The OS cannot be copied from a calculator or between calculators. As there are some hardware differences between the two versions of calculator, I doubt the newer OS will work on the older calculator anyway.
The two different models of HP-48Gii:
The earlier model has 3 AAA batteries and 1 I/O port. This is a Serial (RS-232 type) port and not USB.
The later model has 4 AAA batteries and 2 I/O ports. This is 1 Serial (RS-232 type) port and 1 USB port.
Communicating with the 48Gii's:
For the 4-battery calculator the I/O ports on the calculator are a micro-USB and a custom serial port. I assume you are using the micro-USB port.
The older 3-battery 48Gii can only communicate using a serial port on the computer or using a USB-serial converter (which requires its own driver). The port on the calculator is physically the same as a micro-USB, but it is not USB. This calculator originally came with it's own cable that had a serial 9-pin connector on the computer side.
Please feel free to ask further questions.
Regards.
Note: I do not work for HP, I just like playing with calculators :-)

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