Answer to "Can iPhone 5s screen be replaced from another iPhone 5s?"take note that you need to exchange also the home button since the fingerprint sensor is tied up to the logic board
Answer to "blocked IMEI. what do I do now?"Just sell it to celphone shops where they can dissect the parts one by one and sell them
Answer to "Best screwdriver for step 11 of the iPhone 5s battery repair?"i use the screwdriver along with the kit, works perfectly.
Answer to "Phone dies at 20%"i had same issue with my 2 years old phone, at 30% it will totally shut down, what i did is i replaced the battery, now everything is perfect. i used the ifixit battery replacement kit