Chosen Solution

Whenever I try to restore my iPhone 4s in Itunes, I get error 14. I tried restarting my computer and using different usb ports but nothing helped. Also, ever since I got the error for the first time, my iPhone has been stuck in recovery mode loop. I tried using 3utools to flash the firmware. It failed during the “Writing filesystem” step. Please let me know how to fix this issue.

Error 14 usually means the nand is full. You should be able to restore it not update it. You could try and flash it with 3Utools and see what happens.