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Cannot make/receive calls plus other issues.

Long story short my brother has a preowned Samsung S5 mini running RR-M-v5.7.4-Blackmix-20160921-kminilte on Andriod 6.0.1
I tried to fix this by putting across RR-N-v5.8.5-20171001-karate-Official from my PC to his phone but it wont let me. 
He cannot make or receive calls unless its over something like Facebook's Messenger and has a few in app issues. Does anybody know how to fix this?

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