Leicester drafted in plenty of experience, with over-age stars Danny Simpson and Anthony Knockaert being joined by on-loan Manchester United midfielder Nick Powell and former Reds youngster Tom Lawrence.
The Blues were 4-0 down inside 18 minutes as a Lawrence double, one a penalty, and goals from Jak McCourt, and Joe Dodoo had them reeling.
Sinan Bytyqi struck a post with a free kick, but it was Leicester who roared forward again , Lawrence seeing an effort cleared off the line by Shay Facey before City old boy Kieran Kennedy made it 5-0.
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