Uprade status for Macbook3,1

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A1286 MBP5,3 running 10.9.5, iphone6, Mac mini1,1 A1176 120/2gb
I have a friend who has a Macbook. It is an A1181 (3,1) It is currently running 10.5.8 OS and has only 1gb RAM . What is the max Ram that I can install in it and can the OS be upgraded? Many thanks in advance.
 

pigoo3

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2017 15" MBP, 16gig ram, 1TB SSD, OS 10.15
10.7.5

6gig of ram
 
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A
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Your Mac's Specs
A1286 MBP5,3 running 10.9.5, iphone6, Mac mini1,1 A1176 120/2gb
Thanks Nick! Much appreciated!
 

pigoo3

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Your Mac's Specs
2017 15" MBP, 16gig ram, 1TB SSD, OS 10.15

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