I have seen people who wrap the Tefilin 7 times around their arm and some that wrap it 8 times around their arm. Why do the people who wrap it 8 times do so?


Question: Improper shutdown, now 3 flashes on boot
Answer: I'm afraid you're going to have to fix the installation manually. 

You can download the relevant bin and elf files from the Raspberry Pi GitHub repository.
Then mount the boot partition of the SD card and copy the files onto it.

If this doesn't work then something more serious has gone wrong and you're going to have to re-flash the entire image.
However, you should be able to save your data if you can mount the SD card as you can simply copy off the files you want. They will be in the directory /home/[username].

I hope this helps, let me know if you have any more trouble.