lets stick to prscustomizer
i have 1.2 and have patched it, so it is possible.
so:
1. if you turn off and an the reader (in the menu, not just standby with the slider on top), does it start the prscustomizer from the sd card?
2. when you customized the firmware, copied it to the sd, put it in to the reader and see the menu: which option do you choose?