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Original instructions here: http://fpvlab.com/forums/showthread.php?40059-Fixing-Xiaomi-Yi-Out-of-Focus-Problem&p=785731#post785731
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Instead of only using a knife to remove the hot glue, I highly recommend using Rubbing Alcohol (Isopropyl Alcohol) http://lifehacker.com/5676237/use-rubbing-alcohol-to-remove-hot-glue-from-nearly-anything
a. Take a cotton swab or q-tip and dip it in the alcohol
b. Apply it liberally to the hot glue
c. Give it 10-30s for it to set in
d. Take a knife to the hot glue and scrape it off. It should come off in one large piece! -
After using the alcohol, make sure to let it dry before turning the camera back on