Anyone please help?
installing rx is pretty simpe if you already have gw run and working on your 3ds. and using rx instead of pasta means you're not required to patch agbfirm.
get all required files (there is tutorial on tutorial section of this forum) then put them into your sd card, put rx installer.nds to your blue cart
whichever you'll run from mset/dsprofile depends on which installer you run with your bluecart.
or if you have a working browser, you can use it to run one of them and mset for the other.
if you just want to use rx for gba, after installation process, go to setting and chose boot to sysnand.
the rest is installing gba vc on sysnand, if you don't have dev menu installed on sysnand, install one using redcart on sysnand gw mode first (hold b while selecting gw mode in gw menu.