You tried putting bootmii back on your SD card to have boot2 boot into bootmii and it didn't work? Are you sure that you had eveything on the SD card right?
You tried holding down reset as you boot up your system to try to get priiloader to run and it didn't work?
Double check these things again. If boot2 bootmii and priiloader has been installed, the two cases above should be working to give you chances to fix your system.