Head Unit ums512_1h10_Natv stuck in Fastboot mode - MTCB Android Head Units Q&A

Head unit stuck on Fastboot mode just the car logo show when the car is turned on and the unit is booting, at first the android logo would show and tapping the screen with all fingers would get it unstuck . Now tapping the screen does not work and its just the car logo. Seller send me a file(I am thinking is a Rom file) and instructions down below in a picture. If anyone could help me with this I would greatly appreciate it
Thank you
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Clayton Grove
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