If the phone can not read the memory card or it can not boot up as a result of power problem
Some guys may Disassemble the device to try their chance
FCT sophone 4s link :http://www.fastcardtech.com/goods.php?id=6931
FCT gooapple V6 link:http://www.fastcardtech.com/goods.php?id=7066
As you can see from the above pic ,the Gooapple V6 can directly replace the Memory card easily since you open the backcover .so here i will guide you how to replace the memory card of FCT sophone 4s.see clear the 2 bottom SCREWS.Normally as iphone 4 or 4s ,it has 4-head-cap screw and /or 5-head-cap screw.so you may have to use two kind of screwdrivers
Use the corresponding screwdrivers to unscrewed the bottome cap and open the backcover carefully. see the below FCT sophone 4s .Have a look at the build in SD card slot ,take the memory card out to read on your PC via card reader ,test if the memory card ok .and place well in the slot again .if you lost the data ,you can copy some data before replacement.and take special care with red and black line which connect the battery and the device .
Sometimes your phone can not read the memory ,the memory card may be damaged or poor contact at the junction ,so you have to change or replace it .
That is all ,Thanks for visiting www.talkingmobi.com
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FCT GOPHPNE F27 link:http://www.fastcardtech.com/goods.php?id=7074