crwdns2934241:0crwdne2934241:0 Galal Eltahan

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Help ...My JVC KW-V820BT stuck with firmware upgrade

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My JVC KW-V820BT stuck with  firmware upgrade and keeps restarting and not opening the main screen.

How can I reset it back to the original firmware or reset it?

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JVC KW-V820BT

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open