Recover bricked "Asus Transformer Pad TF300T"
If you can get your device to show up in your PC, or if not, there is luckily a way to revive your device. Before we begin, I present you with this firmware file. Download it, and keep it safe. we may need it.

Alright, so here is the method. If you can make your device appear in a PC, in recovery (teamwin) then just move the above file to a folder on the Transformer's SD card. Then on your device, pick "install update from sd" and find that file. Tap it, then wait. If it succeeds, you WILL be on CM 10.2 (Android 4.3) now, but its better than the alternative.