Phone stuck on spinning Flyme icon

when iam updating 5.1.10OG to 4.5.4IN
Phone stuck on spinning Flyme icon
no responce
pls any one know tell me how to slove this problem

Meizu Pro 5

@vamshikrishna-oruganti performing a such downgrade probably need full wipe

sounds like a bootloop problem. Have yout tried the following?

power off your phone (hold the power button for 5 seconds)
turn it on again while pressing the volume up and then choose clear user data.

It will wipe user data and should wipe the downgrade cache. Hopefully it will work for. Has worked for me in the past but only with upgrades

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