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Disassembling the Nokia 6300 is not very hard and if you know how to disassemble other Nokia phones this will be very easy. You need a Torx T6 screwdriver.

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crwdns2931653:01crwdne2931653:0 Rear Cover

Disassembling the Nokia 6300, Rear Cover: crwdns2935265:01crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

Take off the back cover by pushing it down and sliding it backwards.

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Disassembling the Nokia 6300: crwdns2935265:02crwdnd2935265:01crwdnd2935265:02crwdne2935265:0

Disassembling the Nokia 6300: crwdns2935265:02crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

Take out the battery, SIM card, and MicroSD card.
Unscrew the two T6 Torx screws.

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Disassembling the Nokia 6300: crwdns2935265:03crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

Try to seperate the front cover from the rest of the phone. The front cover is held by four plastic clips.
The first time you do this you may have to use some force but do it in a controlled way. If you break the plastic clips you'll need a new front cover.

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Disassembling the Nokia 6300: crwdns2935265:04crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

You can take off the keypad now, this is sitting loose on top of the sensors.
Unscrew the four remaining T6 Torx screws.
The screws holding the motherboard in place are different from the two previous screws which held the rear cover in place.

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Disassembling the Nokia 6300: crwdns2935265:05crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

The motherboard with it's screen are now loose, you can pop it right out.
If you've been using this phone for a while, there's probably some dust inside the back shell.
There's a lot of contacts exposed, so make sure not to damage those.