Requeriments:
-PSVita/PSTV DB Theme installer 1.1 http://redsquirrel87.com/PSVitaDBThemeInstaller.php
-A Custom Theme of your choice
-Thunderbird for Windows https://www.mozilla.org/en-US/thunderbird/
-A PSVita/PSTV between 3.00 - 3.52 firmware
-A Windows running PC
1.- Getting the app.db File from your PSVita/PSTV.
For this you’ll need to do the Email trick on your PS system for getting the file (if you’ve done it before you can just keep this tutorial). If this is the first time doing the email trick you can check the forum on how to make the first step. You can use this tutorial to start up: http://hackinformer.com/2015/09/24/mr-g ... ist-patch/
To get your app.db you have send an E-mail to your PS system with this text as an attached URL
email:send?attach=ur0:shell/db/app.db.
Here’s a screenshot using Gmail (sorry for the language but I’m Spanish native-speaker)
https://mega.nz/#!Jc5R1YyC!UNoIBZYSMXnt ... _t-rHF5QSY
https://mega.nz/#!dVJCFZBI!JjS3deAB6YiI ... MgNpsHw4CM
Open the Mail app on your PS System and hit it the link on the mail you just received and a window for e-mail writing should be opened, send the email to yourself and open it on your PC. It’s ok if the email app on your PS System closes after hitting send, that’s normal. The attached file in the mail it’s your personal app.db file!
2.- Writing on your app.db file.
In order to activate the themes on your PS system, your app.db must have the info of your custom theme in them. Open the app.db file with the DB Theme Installer and complete the fields.
It should look like this https://mega.nz/#!tZYgxArJ!ARRvFVqhnLkA ... 6GgyGAL3CU
3.- Transfer your Custom theme to your PS System.
You can use any method you want to transfer the folder with the custom theme, like the FTP file transfer method. Notice that the path you choose must be the one you put in the DB Theme Installer.
4.- Write back the app.db file on your PS System.
Using the Thunderbird send an e-mail to you with the subject:
ur0:shell/db/app.db
Attach the app.db file and rename it “#0” (without the quotes) and send it to your Vita.
Here's the screenshot https://mega.nz/#!pFZ0SL6T!EEdZJEYYPRkS ... J2ZPTVUxKA
Open the Mail app and search for the mail you just sent. Click on the attached file (should be displayed as a camera icon. If there’s a “?” symbol, repeat the last step and send again the mail). Close your Mail app (DON’T HIT THE OK BUTTON)
5.- Restart your PS System and go to Settings to change your theme.
5.-Enjoy!

NOTE: rebuilding your Database will reset your app.db and you’ll have to do it all again.
Thanks to Red Squirrel for the tool used in this tutorial and mr. gas for the writemail method.
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