The number on the back is the product model, the serial number is in a sticker on the outside box
The guy from whom I bought my PO-12 sent it to me with the orig. box. The number (which might contain a hint of the firmware used) on the sticker on that box is:
T3FCWNXC
Anybody got an idea if it might be possible to update PO-12 firmware via one of the blank soldering connectors on the back? See this site on which you can see a picture, half way on the page, on which wires are soldered to the back of a Pocket Operator. There are a few more quirks in the PO-12. I might post my personal “How To” that I wrote for myself in a separate topic here. The quirks that I found on mine are:
The step multiplier (flam) indicators next to the icon of the shirt-button don’t work.
On some firmware revisions the step multiplier is not shown when one presses the button combo (= number + BPM/M)
The 16 dashes on the bottom of the display are continously on. They might have been meant to indicate the position of a selected pattern in a song.
Concerning the “reboot” of the PO-12 when the volume is set high. Mine does not have the little kick stand anymore. It happens when I push a lot of buttons. Was very irritating in the beginning because the sequence that you’re working on only gets saved when the unit goes into sleep mode after 5 minutes of inactivity. So if your unit reboots before that: work gone!