Because "K9604W" is a generic Chinese manufacturing model number, there is no single official website. However, here are the best search strategies:
Do not download from password-protected ZIP files on obscure forums—these are often malware. k9604w firmware
Download the k9604w firmware zip file. Extract the contents. You are looking for a single firmware file (e.g., FW96670.bin or k9604w_update.img). Copy this file directly to the root directory of your FAT32-formatted microSD card. Do not put it inside a folder. Because "K9604W" is a generic Chinese manufacturing model
Completely power down your K9604W device. Disconnect it from USB power for 30 seconds. Insert the microSD card containing the firmware. Do not download from password-protected ZIP files on
To manage your device, you first need to know what version it is currently running. This is typically done through the central management software connected to the K9604W: