Showing DEMSBL BOOT Loader for MSM290 on the screen ????
boot loader is like your pc bios set up, it is ready to be flashed, but it's not really quite clear in your problem how you end up with this bootloader mode. if by accident you have pressed some buttons and it is not flashed by any firmware update, try to remove the battery and put it back and switch on, but if you had flashed this by any other firmware, then you had flashed it with wrong firmware version and not suitable for your phone, i suggest to go to your nearest service center and ask their help.
take care.
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