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I am trying to root an Acer Iconia Tab A200 tablet using a script. I have adb working and fastboot works too, however, command fastboot devices returns a list of question marks. Eg:

???????????? fastboot

Image ilustrates the steps followed and the result:fastboot

I execute command fastboot devices in the bootloader which is already unlocked. Using Ubuntu 14.04. udev settings are already set (the file with vendors IDs).

What can I do to get the correct result? How can I make fastboot work well?

Thanks in advance!

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  • Android devices often have a different vendor/product ID in fastboot mode to when they're booted normally. Have you made sure to enter both in the udev config? – Dan Hulme Jun 1 '14 at 18:57
  • @DanHulme ok, I found something about adding a particular ID for the device and added it to the udev file, however, I still get the same results. – Francisco Jun 1 '14 at 21:06
  • You don't need to "find something" about it: the ID is different for each device. You can find it by running lsusb. – Dan Hulme Jun 1 '14 at 21:52
  • @DanHulme dude, that is exactly what I meant with something. Anyway, I added it to the file using the udev notation but got the same result. This is the text I found and the id result of the command lsusb: SUBSYSTEM=="usb", ATTRS{idVendor}=="0502", ATTRS{idProduct}=="3201", MODE="0666", GROUP="plugdev", OWNER="ln" – Francisco Jun 2 '14 at 2:00
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It can be a cable fault. Change the cable. In my Redmi 3 on a cable from old Xperia P i've had question marks, replaced the cable to a newer cable from Redmi Note 2 and voila - the correct number displays instead of the question marks.

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