a friend of mine got a bricked FP2 through an update. We dont know why it happened but he asked me to help him fix it. The first problem which holds me back from fixing is that Windows points out that it cant recognize the device when connected via USB to the computer. Weird, because I also owned a FP2 for a few years (before my FP3) and Windows recognized it anytime. Yeah, sometimes ADB had some trouble but thats another thing. Do you have some thoughts to help me overcome this issue?
I confirm that with the phone in fastboot mode and connected via USB the command line in adb cannot find it as you can see here:
Also you can see how Win7 behaves when the FP2 is connected via USB (its in german, sorry):
That ADB can’t find the phone in Fastboot Mode is normal, only the fastboot command works in Fastboot Mode.
That the fastboot command can’t find the phone is an issue, but at least the fastboot command doesn’t throw an error message already just for running it, so it indeed seems there’s driver trouble.
You could try whether these resources here fix it for you …
There are driver/ADB/Fastboot installers for Windows, too. If the driver alone doesn’t help, perhaps you might want to try those, perhaps they do the trick …
Usually every USB device has a programmed string that is submitted to the OS when the device is connected, considered that communication works. (In Windows, this string can be read in the device manager, probably with an exclamation mark next to it.)
Situations where e.g. Windows reports an “unknown device” are when there is voltage, but no data flow. The string is not submitted to the OS. (It is like meeting a person whom I ask “Hi, who are you?”, and the person just does not answer.)
Seems like the device (FP2) is bricked and cannot communicate over USB anymore…
I cannot install these following the installation guide: due to the fact that Win7 cant detect the device, it is not shown in the device manager, so Im stuck on step5 of the installation guide and cant go further.
When I want to download the file it reports on the page “invalid file”.
Isn’t it shown in the Device Manager as an Unknown Device under the USB Root Hub entry in the same way as in your screenshot? This should allow to install drivers for it manually by right-clicking it in the Device Manager (similar to what the guide suggests for when Windows can identify it).
In Device Manager you can enable View - Show hidden devices.
Is it visible then, or is anything maybe conflicting visible there (other smartphone names, older drivers, anything with “MTP” or “ADB” in its name)?
You were right, it was hidden but when I tried to update the driver software with the Google driver or adb drivers it reports that the driver software is the latest.
This is the error code I see when I open the characteristics to the “unknown device”:
You could also boot a Linux Live DVD or USB stick on your computer to see whether Linux can get fastboot to work with the phone. I would recommend Ubuntu, because it is very popular and thus has vast online coverage for almost any topic.
If your friend is lucky, it might just be a failure with the FP2 USB jack, although the bottom module is fairly new. Unfortunately such jacks belong to the group of most vulnerable parts due to daily plugging/unplugging of cables…