Solution: On some Nokia T10 firmware versions, the bootloader command is disabled. In that case, use:
adb reboot fastboot
or
adb reboot bootloader_fastboot
(Unisoc chips sometimes use custom reboot targets.)
This is the most consistent way to enter Fastboot without wrestling with button timing. It requires a computer with ADB (Android Debug Bridge) installed. Enable Developer Options About Tablet Build Number seven times until it says you are a developer. Enable USB Debugging Developer Options and toggle on USB Debugging Connect to PC how to open fastboot mode on nokia t10 better
Nokia T10 utilizes a MediaTek chipset. If adb devices or fastboot devices returns an empty list, the host PC likely lacks the necessary drivers. How to open Fastboot mode on Nokia T10
adb reboot bootloader method).