[A700] Booting failed topic

Hi to XDA comunity
... and happy festive season

I tried to install a new ROM. So, I followed tutorials and I have a huge problem

I passed to unlock the tablet
But, when I tried to install the new Recovery, the installation failed and now, the tablet doesn't want to boot :(

When I boot normaly, in recovery mode or Fastboot mode, I get this message :

Code:

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Bootloader Version JB-653b3d3 (Unlock Mode)
Entering boot menu mode
Booting failed
Bootloader VJB-653b3d3(UnlockMode): Starting Fastboot USB download protocol

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When I send "Fastboot device", the device is shown

When I send "Fastboot flash recovery twrp-2.6.3.0_a700.img"

Code:

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sending 'recovert' <5736 KB>...
But still indefinitely
So I stop and retry and I obtain
downloading 'boot.img'...
FAILED <commande write failed <Unknow error>>
finished. total time: 0.???s

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i tried to erase recovery and retry.
Tried with several USB cables.

I don't know what to do...
I guess it's a fastboot problem ? How can I found a fastboot file ?

Thanks for any help !