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Hello screen not Refund Before Order please read 

Supported Only Passcode Device 

bypass iOS11 up to iOS15 PwnDFU method

Step 1 Download Tool 

https://mega.nz/file/asFDwRgT#2y4McTRPb4uToaPehv8RfO3kbzklkaFFcl22qBveY40

Step 2
Open Tool, Read ECID and Place order.

Step 3

1- Click Run PwDFU ( Number 1 )
2- Boot - Click Run Ramdisk ( Number 2 )
3- Click Check SSH ( Number 3 )
4- Click Backup Activation ( Number 4 ) 

Step 4
Erase or Restore Device

Step 5
Restore on iBoot
1- Click Run PwDFU ( Number 1 )
2- Boot - Click Run Ramdisk ( Number 2 )
3- Click Check SSH ( if iBoot stuck, reopen ) ( Number 3 )
4- Click Restore Activation ( Number 5 )