Developers of these modifications take the original WhatsApp APK, decompile it, alter its core code (often called "smali" code), and then recompile and sign it as a new app. This process allows them to add features that are not available in the official app.
Yes, unless you backed up before uninstalling. Repacks often use different backup paths. Always export chats first. download whatsapp apk latest version for android 236 repack
Official WhatsApp uses the Signal Protocol for true end-to-end encryption. A repack could disable encryption or send a copy of your messages to a third-party server. Developers of these modifications take the original WhatsApp
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