Installed a custom kernel and now cannot get into boot.

I had recently installed the kernel Amplitude 4.2 for AOSP 5.1 devices and my GS5 W8 model was running Lollipop 5.1.1 w/CM12.1 with Xposed modules. The phone boots into the GS5 screen it says the Yellow text at the top (Warranty Bit: kernel) and then immediately shuts down and reboots. It is not recognized by my computer and I cannot get into recovery or download mode. Is there any way to revert changes to the kernel???


Please Help.