[A700] Cannot flash bootloader

[mrbeatnik]

Hi folks.

A700 (US Version) which has not been flashed (or otherwise touched inappropriately) decided to not boot.

Bootloader vJB-653b3d3: Starting Fastboot USB download protocol

is all that shows.

• I have the latest Android SDK, and the latest drivers I can find.
• I have not enabled developer mode (device will not boot, so I cannot)
• Device is seen in Device Manager (ADB Interface > ACER Fastboot interface)
• fastboot devices command shows a device when tablet is connected

However, when attempting to use other FASTBOOT commands (such as flashing unlock_critical), I get errors:
e.g. :

FAILED (remote: ()
finished. total time: 0.000s

Does anyone have any advice?

I'm simply looking to get this up and running through any method (changing bootload to TWRP/loading another OS etc).

Thanks

 

[mrbeatnik]

Hi all,

I've been playing a bit more.
I get a bit further using the following command:

fastboot oem unlock

This shows the Unlock / Exit icons on the A700.
I select the Unlock icon and select it, and the command prompt shows:

...
FAILED (remote: (Unknown error code))

I am guessing not many people check this part of the forum for a tablet that's 6 years old.
Would really like to get this back up and running for car TV for kids if anyone has any further ideas. As you may have guessed, this is my first time fiddling with Android tools.