Hi,
I tried to reinstall Android 9 on my FP2, as I have some issues with it.
(Issues: Random Reboots, Battery lifetime and sudden drop, weak telephone signal).
When I turn the phone in the fastboot mode, my PC can not connect to it. with
adb reboot bootloader
fastboot.exe devices
.
When I check the device drivers in Windows, there is only an Android Driver (no more mobile device, FP2-Driver). And this android driver (VID_18D1&PID_D00D) has an exclamation mark. When I try to make an update, Windows tells me, that this is already the best driver.
I think the idea is to show you (on the left) how icon in device driver changes from icon with question mark to updated icon while Windows updates is done (on the right)…
Now I can not enter my phone…
When finished the reinstallation, I removed the USB cable. Shut down. Put the SIM card into my phone, replaced the battery. Started and when I put in the code, the phone does not open.
I can confirm, having encountered the same problem myself. Windows 10 users should use the general Windows update service (Settings > Update & Security > View optional updates > Driver updates). There are two drivers to update, Android Composite ADB Interface and Qualcomm (if I remember correctly).
Once you’ve rebooted, fastboot works fine!
But the time I wasted messing about before I got there, doesn’t bear thinking about