tecno h5 automatically booting into boot mode

please moderators..I have a tecno h5 that automatically boots into boot mode displaying boot selector options like fastboot, recovery, power down. but none of the options seems to work as the keys are unresponsive even after pressing the corresponding volume down button for each option. I've tried flashing with sp flash tool several times and after each successful flash, there ain't seem to be any slightest impact on these phones. when i format the whole bootloader option in format section, the phone doesn't power on and after re-flashing with a different bootloader gotten from a different h5, the issue keys reiterating. I'm kinda fed up now! any help please?...

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