I haven't thoroughly read every post, but if you're still trying to load the 1.50 homebrew on 6.60 ME, you could try eLoader: http://www.noobz.eu/joomla/news/eloader-prx.html
Basically you run this app, and then using it, run the homebrew that requires 1.50. It makes at least some of them work on newer CFW, so I guess it's worth a try.
Also, if it's a 1.50 homebrew, it is probably kxploited which means it is split over two folders; I believe recombining the two EBOOTs into one can make it work better. To do this get PBP Unpacker and open up the two "EBOOT.PBP" files in it. One of them should only have one file in it, the other one should have more files. Take the one file from the one that only has one and put it into the other EBOOT. Then you should have one EBOOT with all the files in it, which is the one you should put on your MS. (if it isn't split over two files, it is a 1.00 homebrew; the exact same as a 1.50 homebrew, but not kxploited)
Basically you run this app, and then using it, run the homebrew that requires 1.50. It makes at least some of them work on newer CFW, so I guess it's worth a try.
Also, if it's a 1.50 homebrew, it is probably kxploited which means it is split over two folders; I believe recombining the two EBOOTs into one can make it work better. To do this get PBP Unpacker and open up the two "EBOOT.PBP" files in it. One of them should only have one file in it, the other one should have more files. Take the one file from the one that only has one and put it into the other EBOOT. Then you should have one EBOOT with all the files in it, which is the one you should put on your MS. (if it isn't split over two files, it is a 1.00 homebrew; the exact same as a 1.50 homebrew, but not kxploited)