A clean reinstall fixes many stubborn QQ problems — but you don't want to lose your chat history or notes in the process. Here is how to reinstall safely.
Your QQ account, contacts and cloud-synced data are tied to your QQ number, so they come back the moment you sign in again. What can be lost is the locally cached data — the on-device vault where QQ stores recent messages and received files. If you want to keep that, back it up before you uninstall.
Copy QQ's local data folder (its vault of cached chat history and received files) to another drive or folder. This preserves anything stored only on this device.
In a simple markdown or text file, record your QQ number, the phone number it is registered to, and any group IDs you don't want to look up again. Keep it with your backup.
Remove QQ through your operating system's normal app-removal process, then restart your computer to clear any locked files.
Download the latest QQ installer from the official site and install it cleanly. A fresh build resolves corruption that was causing your original problem.
Sign in with your QQ number to bring back your account, contacts and cloud history. If you need the local cache, restore the vault folder you backed up. Your markdown note makes signing in quick.
Your account, contacts and cloud-synced history are tied to your QQ number, so signing back in restores them. Locally cached history stored in QQ's on-device vault can be lost on a clean reinstall, so back that folder up first if you want to keep it.
Copy QQ's local data folder (its vault of cached messages and received files) to a safe location, and keep a markdown note of your QQ number and any group IDs. After reinstalling and signing in, restore the folder if needed.
Yes. Your QQ number plus its password (and your registered phone for verification) are all you need. That is why keeping them in a simple markdown note is a smart habit before any reinstall.
Back up first, then download a fresh official copy and restore in minutes.