Sorry to hear about this issue. I am by no means an expert, but it looks like your a still rooted with s-off. So you should be able to get back to another rooted rom to at least boot up again. One idea that comes to mind is to load up Sprint Lovers last release(rooted 3.70 based stock rom) which comes with two versions. The "All in one update" and the "rom only" update. Here is the thread:
http://forum.ppcgeeks.com/cdma-htc-e...i-all-one.html
You will just need to get the file on your sd card.
What's nice about this rom is it can be read from bootloader since it's a PC36IMG.zip file. So you can enter bootloader (Power button and hold volume down until bootloader comes up) and it will hopefully recognize the zip and ask you to flash it. The all in one update will take your radio down to the previous version as well which I believe you wanted to do in the first place. Or you may just want to try the rom only version to just get back to a bootable rom. One again, I am no expert and will just preface that I am not sure this will work or if it will do anymore harm so it's up to you and your responsibility if you try this.
Lastly, there is a rom thread at xda that is called Sprint lovers evolution which is the same format at Sprint lovers but for the latest rooted gb OTA. You can try that as well. Good luck.