Manual update process: If the official update isn't available, maybe the user can flash an update manually via recovery mode or using ADB tools. This step would require more technical knowledge, so I should explain it clearly with warnings about risks like bricking the device.

Then, checking official websites. If the device is from a company like Xiaomi, Realme, or Samsung, those have well-known sites. But if it's a lesser-known brand, the user might need alternative approaches like contacting customer support or exploring forums.

Troubleshooting: Common issues users might face, like update verification errors or incompatible updates, and how to resolve them. Maybe mention using Safe Mode or checking device model numbers again.