Did I hard bricked my tablet?

Hi,

My Nexus 7 2012 tablet was running very slow with Lollypop 5.1.1, so I tried to downgrade it to Kitkat 4.4.4.

I first installed Clockworkmod 7 and then tried to flash the image. I did it on a Mac Terminal. I had to add ./ in some of the files as I got a fastboot not found error but still kept on showing errors. I finally made the huge mistake of trying to reboot and the tablet hasn´t load from that moment, not even the battery signal. The computer doesn't recognize it either. I have tried several button combinations to start the tablet but nothing works. All I get is a black screen.

Once I got here, could you tell me, is this a hard brick? Is there a solution? Do I have to say goodbye to my tablet? Any help will be very much appreciated.

Thanks in advance.

In case this clears the process, here's what the Terminal showed:

Last login: Sun Jul 3 16:45:48 on ttys000
jurgen:~ admin$ cd /JURGEN/desktop/kitkat
-bash: cd: /JURGEN/desktop/kitkat: No such file or directory
jurgen:~ admin$ cd desktop/kitkat
jurgen:kitkat admin$ ./flash-all.sh
./flash-all.sh: line 17: fastboot: command not found
./flash-all.sh: line 18: fastboot: command not found
./flash-all.sh: line 19: fastboot: command not found
./flash-all.sh: line 20: fastboot: command not found
./flash-all.sh: line 21: fastboot: command not found
./flash-all.sh: line 22: fastboot: command not found
./flash-all.sh: line 23: fastboot: command not found
./flash-all.sh: line 24: fastboot: command not found
./flash-all.sh: line 26: fastboot: command not found
./flash-all.sh: line 27: fastboot: command not found
./flash-all.sh: line 29: fastboot: command not found
jurgen:kitkat admin$ ./flash-all.sh
...
(bootloader) Bootloader is already unlocked
OKAY [ 0.020s]
finished. total time: 0.020s
erasing 'boot'...
OKAY [ 0.143s]
finished. total time: 0.143s
******** Did you mean to fastboot format this partition?
erasing 'cache'...
OKAY [ 0.126s]
finished. total time: 0.126s
erasing 'recovery'...
OKAY [ 0.025s]
finished. total time: 0.025s
******** Did you mean to fastboot format this partition?
erasing 'system'...
OKAY [ 0.627s]
finished. total time: 0.627s
******** Did you mean to fastboot format this partition?
erasing 'userdata'...
OKAY [ 10.666s]
finished. total time: 10.666s
sending 'bootloader' (2100 KB)...
OKAY [ 0.275s]
writing 'bootloader'...
OKAY [ 1.224s]
finished. total time: 1.499s
rebooting into bootloader...
OKAY [ 0.020s]
finished. total time: 0.020s
./flash-all.sh: line 25: ./sleep: No such file or directory
ERROR: Unable to create a plug-in (e00002be)
< waiting for device >
sending 'radio' (16384 KB)...
OKAY [ 2.036s]
writing 'radio'...
FAILED (remote: (BadParameter))
finished. total time: 2.059s
rebooting into bootloader...
OKAY [ 0.020s]
finished. total time: 0.020s
./flash-all.sh: line 28: ./sleep: No such file or directory
ERROR: Unable to create a plug-in (e00002be)
< waiting for device >
archive does not contain 'boot.sig'
archive does not contain 'recovery.sig'
archive does not contain 'system.sig'
archive does not contain 'tos.img'
Creating filesystem with parameters:
Size: 30080499712
Block size: 4096
Blocks per group: 32768
Inodes per group: 8160
Inode size: 256
Journal blocks: 32768
Label:
Blocks: 7343872
Block groups: 225
Reserved block group size: 1024
Created filesystem with 11/1836000 inodes and 159268/7343872 blocks
Creating filesystem with parameters:
Size: 464519168
Block size: 4096
Blocks per group: 32768
Inodes per group: 7088
Inode size: 256
Journal blocks: 1772
Label:
Blocks: 113408
Block groups: 4
Reserved block group size: 31
Created filesystem with 11/28352 inodes and 3654/113408 blocks
--------------------------------------------
Bootloader Version...: 4.23
Baseband Version.....: N/A
Serial Number........: 015d25648b5c1a14
--------------------------------------------
checking product...
FAILED

Device product is 'grouper'.
Update requires 'tilapia'.

finished. total time: 0.123s
jurgen:kitkat admin$ ./flash-all.sh
...
(bootloader) Bootloader is already unlocked
OKAY [ 0.020s]
finished. total time: 0.020s
erasing 'boot'...
OKAY [ 0.017s]
finished. total time: 0.017s
******** Did you mean to fastboot format this partition?
erasing 'cache'...
OKAY [ 0.083s]
finished. total time: 0.083s
erasing 'recovery'...
OKAY [ 0.017s]
finished. total time: 0.017s
******** Did you mean to fastboot format this partition?
erasing 'system'...
OKAY [ 0.109s]
finished. total time: 0.109s
******** Did you mean to fastboot format this partition?
erasing 'userdata'...
OKAY [ 4.938s]
finished. total time: 4.938s
sending 'bootloader' (2100 KB)...
OKAY [ 0.276s]
writing 'bootloader'...
OKAY [ 1.207s]
finished. total time: 1.483s
rebooting into bootloader...
OKAY [ 0.020s]
finished. total time: 0.020s
./flash-all.sh: line 25: ./sleep: No such file or directory
< waiting for device >
sending 'radio' (16384 KB)...
OKAY [ 2.019s]
writing 'radio'...
FAILED (remote: (BadParameter))
finished. total time: 2.034s
rebooting into bootloader...
OKAY [ 0.020s]
finished. total time: 0.020s
./flash-all.sh: line 28: ./sleep: No such file or directory
ERROR: Unable to create a plug-in (e00002be)
< waiting for device >
archive does not contain 'boot.sig'
archive does not contain 'recovery.sig'
archive does not contain 'system.sig'
archive does not contain 'tos.img'
Creating filesystem with parameters:
Size: 30080499712
Block size: 4096
Blocks per group: 32768
Inodes per group: 8160
Inode size: 256
Journal blocks: 32768
Label:
Blocks: 7343872
Block groups: 225
Reserved block group size: 1024
Created filesystem with 11/1836000 inodes and 159268/7343872 blocks
Creating filesystem with parameters:
Size: 464519168
Block size: 4096
Blocks per group: 32768
Inodes per group: 7088
Inode size: 256
Journal blocks: 1772
Label:
Blocks: 113408
Block groups: 4
Reserved block group size: 31
Created filesystem with 11/28352 inodes and 3654/113408 blocks
--------------------------------------------
Bootloader Version...: 4.23
Baseband Version.....: N/A
Serial Number........: 015d25648b5c1a14
--------------------------------------------
checking product...
FAILED

Device product is 'grouper'.
Update requires 'tilapia'.

finished. total time: 0.113s
jurgen:kitkat admin$ ./flash-all.sh
...
(bootloader) Bootloader is already unlocked
OKAY [ 0.020s]
finished. total time: 0.020s
erasing 'boot'...
OKAY [ 0.017s]
finished. total time: 0.017s
******** Did you mean to fastboot format this partition?
erasing 'cache'...
OKAY [ 0.083s]
finished. total time: 0.083s
erasing 'recovery'...
OKAY [ 0.017s]
finished. total time: 0.017s
******** Did you mean to fastboot format this partition?
erasing 'system'...
OKAY [ 0.109s]
finished. total time: 0.109s
******** Did you mean to fastboot format this partition?
erasing 'userdata'...
OKAY [ 4.938s]
finished. total time: 4.938s
sending 'bootloader' (2100 KB)...
OKAY [ 0.276s]
writing 'bootloader'...
OKAY [ 1.213s]
finished. total time: 1.489s
rebooting into bootloader...
OKAY [ 0.020s]
finished. total time: 0.020s
./flash-all.sh: line 25: ./sleep: No such file or directory
< waiting for device >
sending 'radio' (16384 KB)...
OKAY [ 2.027s]
writing 'radio'...
FAILED (remote: (BadParameter))
finished. total time: 2.045s
rebooting into bootloader...
OKAY [ 0.020s]
finished. total time: 0.020s
./flash-all.sh: line 28: ./sleep: No such file or directory
< waiting for device >
archive does not contain 'boot.sig'
archive does not contain 'recovery.sig'
archive does not contain 'system.sig'
archive does not contain 'tos.img'
Creating filesystem with parameters:
Size: 30080499712
Block size: 4096
Blocks per group: 32768
Inodes per group: 8160
Inode size: 256
Journal blocks: 32768
Label:
Blocks: 7343872
Block groups: 225
Reserved block group size: 1024
Created filesystem with 11/1836000 inodes and 159268/7343872 blocks
Creating filesystem with parameters:
Size: 464519168
Block size: 4096
Blocks per group: 32768
Inodes per group: 7088
Inode size: 256
Journal blocks: 1772
Label:
Blocks: 113408
Block groups: 4
Reserved block group size: 31
Created filesystem with 11/28352 inodes and 3654/113408 blocks
--------------------------------------------
Bootloader Version...: 4.23
Baseband Version.....: N/A
Serial Number........: 015d25648b5c1a14
--------------------------------------------
checking product...
FAILED

Device product is 'grouper'.
Update requires 'tilapia'.

finished. total time: 0.112s
jurgen:kitkat admin$

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