Lets put clear that this works for ALL the FW, not to the specific 4.0.1, but in this one we’re going to update to 4.0.1
Requirements:
- A Flash USB of 1GB at least
- A PS4 on a FW lower than the one you want to update (Sorry, not downgrading on this one)
- The update file (Link in first step)
- A PC
So, lets start!
- First of all, you gotta download the 4.0.1 FW in a PUP file,Which you can get clicking this link. Note: if you want another PS4 FW update, Check this page
- Now, format your USB to FAT32 (This will wipe all your data, so make a backup!) – Note: optional if your USB drive is already in FAT32 and has enough space to hold the update file.
- Now, make a folder in your flash drive called “PS4” (without the “) Remember it gotta be in UPPER CASE.
- Inside the PS4 folder, make a folder called “UPDATE” (again without the “) IN UPPER CASE.
- Copy the file you downloaded at the start of the tut to the UPDATE folder.
- Rename the file to “PS4UPDATE”
We’re ready in the PC, now lets go to the PS4.
7- First of all, shut down COMPLETELY your PS4.
8- Now, put your finger like if you were turning the console on, but release it when you hear two beeps.
9- Connect the FLASH drive to the PS4, followed act connect via USB the DS4 and press the PS Button.
10- Select the “Update FW” Option (I think is option 3) and select via USB drive.
11- Follow the steps on screen, and select “Okay”/”Accept” in everything.
The PS4 will reboot a couple of times, and guess what, you have successfully updated your PS4! 
See you next time!
