I see firmware files available online. If you are comfortable with flashing you can try it out. JioPhone has a bunch of model numbers so you would need the firmware file that matches yours.
How did you fix them?
My keys work after putting a lot of force on them and the navigator key doesn't seem to work. These issues have been since day 1.
Opened it up, peeled out the keypad sticker thingy and cleaned the contact points on the PCB with alcohol and pasted the keypad sticker thingy back. You need to be very careful while peeling off the sticker as there are chances of tearing.
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