You need the official WhatsApp - Solved for Gbox Whatsapp

Step1: find another Huawei HMS device, install WhatsApp(F source) from AG, open to Welcome page and exit.

Step 2: use a USB or SD Card to copy chat history from a blocked device to another Huawei mobile.

Step 3: open WhatsApp, log in and restore the backup.

Step4：use Phone Clone to clone back to the blocked device.