the update was completly unnessecary, you can run the game without it. glad you got bootmii as boot2 and could start to mod again.
game guide can be found here Problematic Games & solution
try to Restore Trucha Bug in IOS36
and you should be able to install stuff again. stick to the softmod guide afterwards to get you up and running again, don't forget to install priiloader (and block disc and online updates..).
you should be set up after that to run any game without major issues, minor can be solved with fine tuning, set the right videomode, load from the correct cIOS (223 for metroid m for example) and setting 002 fix on or not.
edit: i would downgrade, i run everything from 4.1 (games are completly firmwareversion independent and run from your cIOS) 4.2/4.3 have no benefit for the user and don't improve anything on your wii..
also an error index available, linked below