Maximum upgradable OS version for the same family devices

B. Diddy

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Welcome to Android Central! Not necessarily. There can be various nuances to each device. Ultimately, it's up to the manufacturer and the wireless carrier to decide.
 

B. Diddy

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I don't believe there's a master list anywhere. If you have questions about official system updates (i.e., not custom ROMs) for a specific device, contact the manufacturer as well as the carrier.