I was trying to unlock my bootloader and in install TWRP on my phone , the bootloader unlocked, I flashed the TWRP image but when it reached recovery, it just showed a dead Android with the message No Command, so quickly flashed the stock recovery - same thing. So now my phone doesn't have a recovery, so when I tried to install an update, it reached the "installing update" screen then showed a dead Android with the word error!
If you have a Micro SD Card, remove it and put it in your PC - you may need a carrier sleeve. Back in the mobile, you might also need a Terminal Emulator to work in the white on black, similar to Windows Command Line. See what files on that card; you might strike lucky.