Metal Gear Solid: Peace Walker

[Finzy]

I've played through the entirety of the game up to Peace Walker battle 2 in builds 0.9.8 and now 0.9.9 on the EU version (and PC version of PPSSPP), is there really no cheat code for the EU release? Do I absolutely need to switch over to the US version to beat Peace Walker battle 2?

Right now in peace walker battle 2, I can at best cause 2 bars of damage to the boss and then its health just stops dropping any further no matter how many missiles I shoot at it, on the latest official build (0.9.9).

Otherwise I've had no issues with the game apart from random minor audio glitches and displaced text, it hasn't frozen at any points. And getting Snake to run seems to require really hard pushing of the analog stick sometimes, I'm using an Xbox360 gamepad and unless I'm fully pushing the stick, he nearly always just walks, like the sensivity or dead zone were off.