For Pita90: Make sure you have a exfat formatted usb 3.0/ external usb 3.0 HDD formatted as exfat with fpkg's on the root of the device.
Go here to download a FPKG:
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1. Go to Network settings DNS settings
2. Primary to 165.227.83.145 and the Secondary DNS to 108.61.128.158
3. save network settings
4. go to system settings
5. open user manual
6 select 5.05
7. select mira
8. go back to system settings and go to the very bottom
9. select debug settings
10. go to game
11. select install pkg from the root of your drive
12. press the PS button and go back to the home screen and launch your newly installed backup
Notes:
You will have to install mira by following the steps 1-7 above after each reboot.
Go here for information on how to send payloads to mira 5.05:
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Have any further questions feel free to ask