Hi! I'm not sure what can be done if you can't get into recovery or download modes....but read through this thread. Perhaps there is something helpful in the thread.
Now, you need 10 posts under your belt to post in development sections. So maybe try making a thread in the Q&A section looking for help. Be very specific with your issue details. Here's the Q&A section...
You can also look around a contribute some useful posts to get your post count high enough to post in the first thread I linked.
Hopefully you can bring it back to life....tho honestly, flashing another phone models kernel could have very well bricked you. You can look into getting it fixed, but it may cost too much for an older device.
---------- Post added at 09:41 PM ---------- Previous post was at 09:35 PM ----------
Try kies as well.