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If you mean this one the only actual difference is that gnd doesn't use pin 6 but instead the shield. (I think you'll find this method easier than opening up the plug again to do more pin swapping.)
Thing is, that diagram shows you what goes where, but then it's up to you to find a way to connect everything.

Red and orange are the data lines and they cross over, so in on one side becomes out on the other side. That's most likely where the error is.  Either you're not remembering correctly which of the two wires you used for the pin swap, or you did the pin swap with the wrong one, so +5V is correctly placed, but data connects to the Gameboy's data output.

Sorry to be quite the killjoy, but I had to edit the title...

Mindless: You need to use the so called vin pin (pin 31 on the cartridge slot) instead of /wr to perform a write to the flash chip.

Frostbyte: Yeah, with an AAA sized Li-Ion battery and a spacer.

OH so this is a single tap transformer that you're using just as an inverter. Then there's the risk that you'll get a phase difference and/or difference in amplitude between the positive and negative signal. And the tranformer is sensitive to picking up certain noise. In the end, you may get more noise than you started out with.

I'm having difficulty reading the schematic from the board. In part because I can't see the bottom side, in part because the solder mask makes it difficult to see the traces. For example, I can't see that jack one is connected anywhere at all (except for to the big ground plane). No traces as far as I can see, and no vias to the other side. Would you mind providing the schematic?

Yeah, and shitty iron. Those "pegs" sticking out of the solder joints are a tell-tale sign of this. I can't stand a 30 W iron that looses its heat as soon as you touch a joint. You need a reasonable quality temperature controlled iron. Something like a Weller or a Hakko. Of course, a lot of it is technique, like preheating the component before applying the solder, applying flux if needed or using flux core wire as well as keeping the tip clean. My preferred method for this is using a brass sponge, rather than a wet sponge.
^ Soldering micro tutorial

Anyway, if I'm understanding this correctly, it's a center tap transformer, where you drive the outer sides with left and right. A couple of thoughts: This is a double sided board right? I'm almost certain it could be optimized to use only one side. However, this probably wouldn't be much use since the jacks you're using are SMD and you want all components on the same side. Are the two sides of the transformer galvanically isolated? This could be an added benefit from using this circuit, if designed properly. Yet another, more expensive idea (both in terms of components and design) is to make the circuit active by using an opamp as a differential amplifier, driven by phantom power.
Or, yet another idea (Sorry for killing this darling early by thinking for a minute) hook up a 3.5 mm jack so that it connects to a balanced input. I guess this is as simple as using a 3.5 mm -> 6.35 mm ("1/8" -> 1/4) stereo cable, given that the mixer has a 1/4 in balanced input jack. So there you go...