help highscreen jet duo

my highscreen jet duo stuck at "highscreen" logo at start.

i followed every instruction for firmware upgrade provided at hihscreen.org.
restarted phone with volume down button then after android logo i plugged in usb to pc. then run download.bat file as instructed.
it ran successfully saying device detected and flashed boot.img, then recovery.img and then system.img. later with erasing cache n user date phone reboots. android logo showed up then highscreen logo. but then....... nothing seems to be happening.
please help.

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