Samsung Galaxy Nexus Bootloop. Cannot format or write data
So after searching lots of forum, chatting with experts in XDA, I found out that:


  Samsung used a cheap substandard emmc.


I have tried everything from adb, Odin to jtag. The emmc just died,no way to fix it.

First there was this awful lag issue : Galaxy Nexus GSM bad eMMC chip type V3U00M phone is almost unusable 

Later within 2 years, emmc will die and you will stuck with bootloop issue : 
Galaxy Nexus GT-I9250 with hardlocked NAND ?!? need help !
Galaxy Nexus S (i9250) stuck in reboot loop - gets to OS loading and restarts 

Almost all of us with V3U00M chip and other defective mmc chips would have now got there emmc fried.


  What to say, on my side I'm blacklisting Samsung, this phone has been a joke for me since the beginning (the fstrim bug has been a nightmare), if you dare you can try to replace the board.