The following Installation METHODS require the Support Scripts Directory.
If it does not exist on your hotspot, Install it as follows.

Log into your hotspot
User ID = pi-star
Password = raspberry

Type ls -al

If you see the Scripts directory in the resultant list, proceed to Method 1
Otherwise do the following

Type rpi-rw
Type sudo su
Type git clone https://github.com/TGIF-Network/Scripts

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METHOD 1 - Pi-Star Script

1) Log into your Pi-Star Hotspot via PUTTY (Do Not Use the Pi-Star SSH Shell)
2) TYPE sudo su

Do This (or)
3) TYPE rpi-rw
4) TYPE rm -r Scripts
5) TYPE git clone https://github.com/TGIF-Network/Scripts
6) TYPE cd Scripts

(or) cut & paste the following
rpi-rw;rm -r Scripts;git clone https://github.com/TGIF-Network/Scripts;cd Scripts

Here you have a choice
A) Mitch EA7KDO's Screen Package
     7) TYPE ./gitcopy2.sh
          and follow the prompts
or
B) Phil VE3RD's Beta Package
     7) TYPE ./gitbeta2.sh
         and follow the prompts

In about 10-12 seconds you will see  a script complete message

Now, go to your Nextion Display and select the Flash Screen
Touch  "Select" in the top right corner, This will expose the FLASH button.
Press the FLASH Button

The screen will restart when the flash sequence completes.

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METHOD 2 - SCREEN FLASH

1) Select the FLASH Screen on your Nextion Display.
2) Touch "Select" in the top right corner of the screen.  This will expose the FLASH and GitCpy buttons.

If your screen has two buttons as follows (Gitpyy EA7KDO) and (GitCpy BETA) then proceed. otherwise do METHODE 1 above
3) To load Mitch's Screen package press GitCpy EA7KDO
or
3) To load Phil's Beta Screen package press GitCpy BETA

4) In about 10-12 seconds you will see  a script complete message

5) Press Flash

6) The screen will restart when the flash sequence completes.