Thx,that was helpful.

The player can earn an upgrade to retain all of their perks except Quick Revive after being downed and revived by Quick Revive or another teammate, being revived by the Pack-a-Punched Ballistic Knife will cause all perks to be lost but not the upgrade. This upgrade is obtained when the player buys four perks before round four.
In a game with two or more players, the player will retain all of their perks except for their last obtained perk. Quick Revive will always be lost first, however.

But this only works in Tranzit, Die Rise and Buried only though

haha,we maybe can hit 40rounds in the futrue. lets try again next time.

Our zombies match was lots of fun, nice playing with you