Error : Unable to receive message from FDR

[Sakib Ahmed]

Hello, I'm trying to recover my old iPhone 6 but nothing is working, today when I tried to restore using 3u tools, I got "ERROR: Unable to receive message from FDR 16DB5088 (-4). 0/2 bytes" But I get that message after my iphone decides to reboot back to recovery mode, I have no idea how why it restarts before finishing restore.
I also get a warning saying "Unable to find BbSkeyld node".
Can someone explain what's wrong with my iphone. Please
Thanks !

[jiuer7845]

asasas