Default Unknown Error 150

Need some advice else will return phone to service center if unable to DIY to fix.

Have a D855 here. Phone is stock, not rooted. During file transfer, it frozen and rebooted into a white screen asking for "Enter pin/password to decrypt storage". Don't recall setting a pin thus have no clue what to input. Phone started making clicking sound after 10 seconds.

Did a VolDown+Power to entry Factory Reset but return with "e:failed to mount /cache (unknown error 150)"

Able to hold VolDown and enter Download Mode but as I have a Mac here, not sure which tool to execute. Can I recover with *.kdz?
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