[pradipacharya]

Today I received system upgradation in my Samsung on7pro android mobile....
But with upgradation of system my gujarati key board became more complicated.... now I want to undo last upgradation.....

[hallux]

If it was an OS update, it's not so easy. Typically, you'd need to find what is called the ROM from Samsung, use a tool called ODIN to install it and, oh yeah, make sure you have a backup of your data from the device as that will usually result in a full reset of the device.

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