I understand you're looking for a reliable way to enter Fastboot mode on a Nokia T10 tablet, and you prefer a method that’s as clear as a printed paper guide. Since I can’t physically provide paper, I’ll give you step-by-step instructions you can print or copy onto paper.
Opening Fastboot mode is only half the battle. Once you see the dark screen with “=> FASTBOOT mode” text, you can: how to open fastboot mode on nokia t10 better
Open Terminal: Open a Command Prompt, PowerShell, or Terminal window on your PC where you have Platform-Tools (ADB) installed. I understand you're looking for a reliable way
Hold Combination: Simultaneously press and hold the Power button and the Volume Down button. Check Device Manager for "Unknown Device" → Update
Keep both buttons pressed for about 10–15 seconds until you see the FASTBOOT mode text or the Nokia logo with “Fastboot” written at the top or bottom.