Hi rel4y , I can confirm they are working for me ....the updated PCB was to include some resistors that were left out , but were in earlier versions of MMjoy2 and MMjoy PCB designs.I was having (many) issues without them with keys pressing themselves at random and the Chips just stopping working in MMJoy2...was pretty frustrating till Erichos found the main issue ..the missing 10K resistor on the Data Trace.

I actually didn't make PCB's or Order Them for my SR Boards I made them using Prototype Board and just copying the traces from that PCB design. I also used Sockets for the Chips in case one ever burns out, so I can replace it easily. I used Sprint Viewer to look at the PCB designs and Print them , Sprint Demo doesn't allow Printing....

As for SR Boards and Button Matrixes ...it is one or the Other ... the SR replaces the need for button Matrixes but you can use both in One Stick . With Button Matrices you need to use 1N4148 Diodes as well so you don't get repeated Keys (ghosting) etc , Neither the Diodes or SR's are expensive enough to have to Order from AliExpress , which can take months in some cases...at least for me...

bit more info in the Wiki here in case you didn't see it yet too: https://github.com/MMjoy/mmjoy_en/w...-and-setting-up-software#shift-registers