恢复已删除的QQ或微信聊天记录可以参考以下方法：
恢复QQ聊天记录：
1. 同步聊天消息：在手机的设置中，找到并点击“通用”，在通用中点击“聊天记录”，进入后可以看到“同步最近聊天消息至本机”的选项，点击该选项，就可以将聊天记录进行恢复了。
2. 使用PC恢复软件：在电脑上下载并打开互盾苹果恢复大师，通过该软件对手机进行数据扫描，找到并点击需要恢复的聊天记录，最后点击“导出选中记录”即可。
恢复微信聊天记录：
1. 开启聊天记录漫游：在QQ的设置中，找到并点击“通用”，在通用中点击“存储空间管理”，再点击“聊天记录漫游”，开启漫游功能后就能够将已删除的聊天记录进行恢复了。
2. 使用消息管理器：在电脑上登录QQ，点击左下角的“三杠”，然后点击“消息记录”，在弹出的对话框中，搜索已删除好友的聊天记录，点击右上角的三角形标志，使用“导出所有消息记录”对聊天记录进行恢复。
需要注意的是，以上方法并不能保证100%恢复已删除的聊天记录，因为它们有可能被覆盖或清空。同时，建议在操作前先备份好相关数据，以免数据丢失。
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