stuck on bootloader help!!!

[turboll]

my evo had the froyo 2.2 i downgraded to 2.1 used the simple root 1 click and then hit then i flashed recovery then once in bootloader applied update from sim card omj froyo whatever and the i said ereasing files, coping files and the said complete but when when rebooted the phone doesnt go farther than the yellow 4g and sprint how do i fix