You can simply check if you'll get this trouble by this way:
Cut a slice of paper by scissors or your hair and try to stick into left of the receiver. If you can stick into it, then your front camera will be dusty someday.
1. Your RN2
3. Double-sided tape
4. Foam rubber tape (Optional)
6. Tiny Screwdriver
7. Glasses cloth
Let get started!
First, screw up "12" tiny screws, two of it has stickers on it. I don't even want to send back China to repair it, so don't worry about the stickers.
now, you have to use your nail stick into the left corner of the phone, then follow the slit between main-board base and main-board cover.
You should slit the left side till the "volume + " button and stop here.
Now, stick into the first place and start to slit right, you'll meet right down corner, then keep on.
Keeps slit to the right up corner near the screw hole than stop here.
Here's the most difficult part, you should carefully hold both side of the cover and slowly pull up them by your prefer hand.
The other hand, again use your nail to slit into it, this would be hard, so be patient and carefully, or you'll brake your main-board cover into two piece
After you finish previous step, it is getting easy now.
What I point out is the front camera module, carefully pick it up with your nail , you can clean the dust now
Be very carefully that don't bend the cable or you'll screw all up
Use whatever you like to clean up the space between camera and glass.
Now, times to seal it up!
Use the double-side tape to stick on the back of the front camera module
First, cut it to fit the size of camera and stick on it one by one. Don't forget to remove both of the sticker.
I use 4 piece of the tape. Remember, don't remove the last sticker of the tape!
After that, you can put back your camera module.
Now, you can put back your main-board cover and try to boot your device, if it boot up and nothing hurt, then you are free to go
All the pics took by my old Lenovo A820